I think we need a complete list of world leaders for scenario makers so that they don't use 'Egyptian Leader' or 'Tutankhamen' instead of the real leader (in modern scenarios). This is the list of people who attended at the UN Summit. It's slightly out of date (Bill Clinton, for example) but it should be useful.
AFGHANISTAN: Professor Burhanuddin Rabbani (Afghanistan's ruler is actually Mullah Mohammed Omar Mujahid)
ALBANIA: President Rexhep Meidani
ALGERIA: President Abdelaziz Bouteflika
ANDORRA: Prime Minister Marc Forne Molne
ANGOLA: Minister of External Relations Joao Bernardo de Miranda
ANTIGUA AND BARBUDA: Prime Minister Lester B. Bird
ARGENTINA: President Fernando de la Rua
ARMENIA: President Robert S. Kocharian
AUSTRALIA: Prime Minister John Howard
AUSTRIA: President Thomas Klestil
AZERBAIJAN: President Haydar Alirza oglu Aliyev
BAHAMAS: Governor-General Orville Turnquest
BAHRAIN: Emir, Sheikhh Hamad Bin Isa Al-Khalifa
BANGLADESH: Prime Minister Sheikhh Hasina
BARBADOS: Prime Minister Owen S. Arthur
BELARUS: President Alexander Lukashenko
BELGIUM: Prime Minister Guy Verhofstadt
BELIZE: Prime Minister Said Musa
BENIN: President Mathieu Kerekou
BHUTAN: Chairman of the Council of Ministers Yeshey Zimba
BOLIVIA: President Hugo Banzer
BOSNIA: President Alija Izetbegovic
BOTSWANA: President Festus G. Mogae
BRUNEI: Sultan Hassanal Bolkiah Mu'izzaddin
WadJaulah
BULGARIA: President Petar Stoyanov
BURKINA FASO: President Capt. Blaise Compaore
BURUNDI: Foreign Minister Severin Ntahomvukiye
CAMBODIA: Prime Minister Samdech Hun Sen
CAMEROON: President Paul Biya
CANADA: Prime Minister Jean Chretien
CAPE VERDE: President Antonio Mascarenhas Monteiro
CENTRAL AFRICAN REPUBLIC: President Ange-Felix Patasse
CHAD: Prime Minister Nagoum Yamassoum
CHILE: President Ricardo Lagos
CHINA: President Jiang Zemin
COLOMBIA: President Andres Pastrana
COMOROS: President Col. Azaly Assoumani
CONGO (Republic): President Denis Sassou Kabila
COSTA RICA: President Miguel Angel Rodriguez
CROATIA: President Stipe Mesic
CUBA: President Fidel Castro
CYPRUS: President Glafcos Clerides
CZECH REPUBLIC: President Vaclav Havel
DENMARK: Prime Minister Poul Nyrup Rasmussen
DJIBOUTI: President Ismail Omar Guelleh
DOMINICA: Prime Minister Roosevelt Douglas
DOMINICAN REPUBLIC: President Hipolito Mejia
ECUADOR: President Gustavo Noboa
EL SALVADOR: President Francisco Guillermo Flores
EQUATORIAL GUINEA: President Teodoro Obiang Nguema Mbasogo
ERITREA: President Isaias Afwerki
ESTONIA: President Lennart Meri
ETHIOPIA: Prime Minister Meles Zenawi
FINLAND: President Tarja Halonen
FRANCE: President Jacques Chirac
GABON: President Omar Bongo
GAMBIA: President Yahya A.J.J. Jammeh
GEORGIA: President Eduard A. Shevardnadze
GERMANY: Chancellor Gerhard Schroeder
GHANA: President Flt-Lt (Rtd) Jerry John Rawlings
GREECE: Prime Minister Costas Simitis
GRENADA: Prime Minister Dr. Keith C. Mitchell
GUATEMALA: President Alfonso Portillo
GUINEA: Prime Minister Lamine Sidime
GUINEA BISSAU: President Kumba Yala
GUYANA: President Bharrat Jagdeo
HAITI: President Rene Preval
HOLY SEE: Angelo Cardinal Sodano, PM
HONDURAS: President Carlos Roberto Flores
HUNGARY: President Ferenc Madl
ICELAND: Prime Minister David Oddsson
INDIA: Prime Minister Atal Behari Vajpayee
INDONESIA: President K. H. Abdurrahman Wahid
IRAN: President Mohammad Khatami
IRAQ: Deputy Prime Minister Tareq Aziz
IRELAND: Prime Minister Bertie Ahern
ISRAEL: Prime Minister Ehud Barak
ITALY: Prime Minister Giuliano Amato
JAMAICA: Prime Minister Percival Patterson
JAPAN: Prime Minister Yoshiro Mori
JORDAN: King Abdullah II Bin Hussein
KAZAKHSTAN: President Nursultan A. Nazarbayev
KENYA: President Daniel Toroitich arap Moi
KIRIBATI: President Teburoro Tito
KOREA-SOUTH: President Kim Dae-jung
KOREA-NORTH: Kim Yong-nam (designated head of state,
Presidium Chairman of Supreme People's Assembly)
KUWAIT: Sheikh Jaber al-Ahmad al-Jaber al-Sabah
KYRGYZSTAN: Mr. Muratbek C. Imanaliev
LATVIA: President Vaira Vike-Freiberga
LEBANON: Chief of the Lebanon Delegation Selim Tadmoury
LESOTHO: Prime Minister Pakalitha Mosisili
LIBYAN ARAB JAMAHIRIYA: Mr. Abdurrahman Mohammed Shalghem
LIECHTENSTEIN: Prime Minister Mario Frick
LITHUANIA: President Valdas Adamkus
LUXEMBOURG: Deputy Prime Minister Lydie Polfer
MACEDONIA: President Boris Trajkovski
MADAGASCAR: President Didier Ratsiraka
MALAWI: President Bakili Muluzi
MALDIVES: President Maumoon Abdul Gayoom
MALI: President Alpha Oumar Konare
MALTA: Prime Minister Edward Fenech Adami
MARSHALL ISLANDS: President Kessai Note
MAURITANIA: President Col. Maaouya Ould Sid' Ahmed Taya
MAURITIUS: Prime Minister Navinchandra Ramgoolam
MEXICO: President Ernesto Zedillo (President is now Vincente Fox)
MICRONESIA: President Leo A. Falcam
MOLDOVA: President Petru Lucinschi
MONACO: Crown Prince Albert
MONGOLIA: President Natsagiyn Bagabandi
MOROCCO: King Mohammed VI
MOZAMBIQUE: President Joaquim Alberto Chissano
NAMIBIA: President Sam Nujoma
NAURU: President Bernard Dowiyogo
NEPAL: Prime Minister Girija Prasad Koirala
NETHERLANDS: Prime Minister Wim Kok
NEW ZEALAND: Prime Minister Helen Clark
NICARAGUA: President Arnoldo Aleman
NIGER: President Tandja Mamadou
NIGERIA: President Olusegun Obasanjo
NORWAY: King Harald V
PAKISTAN: Chief Executive Gen. Pervez Musharraf
PALAU: President Kuniwo Nakamura
PAPUA NEW GUINEA: Prime Minister Sir Mekere Morauta
PARAGUAY: Vice President Julio Cesar Franco
PERU: President Alberto Fujimori
PHILIPPINES: President Joseph E. Estrada
POLAND: President Aleksander Kwasniewski
PORTUGAL: Prime Minister Antonio Guterres
QATAR: Sheikh Hamad bin Khalifa al-Thani
ROMANIA: President Emil Constantinescu
RUSSIA: President Vladimir V. Putin
RWANDA: President Maj-Gen Paul Kagame
ST. KITTS AND NEVIS: Prime Minister Dr. Denzil Douglas
ST. LUCIA: Prime Minister Kenny D. Anthony
St. VINCENT AND THE GRENADINES: Governor-General Charles
Antrobus
SAN MARINO: Maria Domenica Michelotti and Gian Marco
Marcucci (heads of state, captains-regent)
SAUDI ARABIA: Crown Prince Abdullah bin Abdul-Aziz al-Saud
SAO TOME AND PRINCIPE: President Miguel Trovoada
SENEGAL: President Abdoulaye Wade
SIERRA LEONE: President Ahmad Tejan Kabbah
SINGAPORE: Prime Minister Goh Chok Tong
SLOVAKIA: Prime Minister Mikulas Dzurinda
SLOVENIA: President Milan Kucan
SOLOMON ISLANDS: Prime Minister Manasseh Sogavare
SOMALIA: Abdiqassim Salad Hassan
SOUTH AFRICA: President Thabo Mbeki
SPAIN: Prime Minister Jose Maria Aznar
SRI LANKA: The Honorable Lakshman Kadirgamar, Master of Parliament, Foreign Minister
SUDAN: President Lt-Gen. Omer Hassan al-Bashir
SWAZILAND: King Mswati III
SWEDEN: Prime Minister Goran Persson
SWITZERLAND: President Adolf Ogi
TAJIKISTAN: President Emomali Rakhmonov
TOGO: President Gen. Gnassingbe Eyadema
TONGA: Prime Minister Prince 'Ulukalala Lavaka Ata
TRINIDAD AND TOBAGO: Prime Minister Basdeo Panday
TUNISIA: President Zine al-Abidine Ben Ali
TURKEY: President Ahmet Necdet Sezer
TURKMENISTAN: President Saparmurat A. Niyazov
TUVALU: Prime Minister Ionatana Ionatana
UGANDA: First Deputy Prime Minister Eriya Kategaya
UKRAINE: President Leonid D. Kuchma
UNITED KINGDOM: Prime Minister Tony Blair
UNITED STATES: President Bill Clinton
URUGUAY: President Jorge Batlle
UZBEKISTAN: President Islam A. Karimov
VANUATU: Prime Minister Barak Tame Sope
VENEZUELA: President Hugo Chavez
VIETNAM: President Tran Duc Luong
YEMEN: President Ali Abdullah Saleh
ZAMBIA: President Frederick J.T. Chiluba
ZIMBABWE: President Robert G. Mugabe
PALESTINIAN AUTHORITY: President Yasser Arafat
Not attending:
IRAQ: Saddam Hussein
LIBYA: Muammar Gaddafi
NORTH KOREA: Kim Jong-il
AFGHANISTAN: Professor Burhanuddin Rabbani (Afghanistan's ruler is actually Mullah Mohammed Omar Mujahid)
ALBANIA: President Rexhep Meidani
ALGERIA: President Abdelaziz Bouteflika
ANDORRA: Prime Minister Marc Forne Molne
ANGOLA: Minister of External Relations Joao Bernardo de Miranda
ANTIGUA AND BARBUDA: Prime Minister Lester B. Bird
ARGENTINA: President Fernando de la Rua
ARMENIA: President Robert S. Kocharian
AUSTRALIA: Prime Minister John Howard
AUSTRIA: President Thomas Klestil
AZERBAIJAN: President Haydar Alirza oglu Aliyev
BAHAMAS: Governor-General Orville Turnquest
BAHRAIN: Emir, Sheikhh Hamad Bin Isa Al-Khalifa
BANGLADESH: Prime Minister Sheikhh Hasina
BARBADOS: Prime Minister Owen S. Arthur
BELARUS: President Alexander Lukashenko
BELGIUM: Prime Minister Guy Verhofstadt
BELIZE: Prime Minister Said Musa
BENIN: President Mathieu Kerekou
BHUTAN: Chairman of the Council of Ministers Yeshey Zimba
BOLIVIA: President Hugo Banzer
BOSNIA: President Alija Izetbegovic
BOTSWANA: President Festus G. Mogae
BRUNEI: Sultan Hassanal Bolkiah Mu'izzaddin
WadJaulah
BULGARIA: President Petar Stoyanov
BURKINA FASO: President Capt. Blaise Compaore
BURUNDI: Foreign Minister Severin Ntahomvukiye
CAMBODIA: Prime Minister Samdech Hun Sen
CAMEROON: President Paul Biya
CANADA: Prime Minister Jean Chretien
CAPE VERDE: President Antonio Mascarenhas Monteiro
CENTRAL AFRICAN REPUBLIC: President Ange-Felix Patasse
CHAD: Prime Minister Nagoum Yamassoum
CHILE: President Ricardo Lagos
CHINA: President Jiang Zemin
COLOMBIA: President Andres Pastrana
COMOROS: President Col. Azaly Assoumani
CONGO (Republic): President Denis Sassou Kabila
COSTA RICA: President Miguel Angel Rodriguez
CROATIA: President Stipe Mesic
CUBA: President Fidel Castro
CYPRUS: President Glafcos Clerides
CZECH REPUBLIC: President Vaclav Havel
DENMARK: Prime Minister Poul Nyrup Rasmussen
DJIBOUTI: President Ismail Omar Guelleh
DOMINICA: Prime Minister Roosevelt Douglas
DOMINICAN REPUBLIC: President Hipolito Mejia
ECUADOR: President Gustavo Noboa
EL SALVADOR: President Francisco Guillermo Flores
EQUATORIAL GUINEA: President Teodoro Obiang Nguema Mbasogo
ERITREA: President Isaias Afwerki
ESTONIA: President Lennart Meri
ETHIOPIA: Prime Minister Meles Zenawi
FINLAND: President Tarja Halonen
FRANCE: President Jacques Chirac
GABON: President Omar Bongo
GAMBIA: President Yahya A.J.J. Jammeh
GEORGIA: President Eduard A. Shevardnadze
GERMANY: Chancellor Gerhard Schroeder
GHANA: President Flt-Lt (Rtd) Jerry John Rawlings
GREECE: Prime Minister Costas Simitis
GRENADA: Prime Minister Dr. Keith C. Mitchell
GUATEMALA: President Alfonso Portillo
GUINEA: Prime Minister Lamine Sidime
GUINEA BISSAU: President Kumba Yala
GUYANA: President Bharrat Jagdeo
HAITI: President Rene Preval
HOLY SEE: Angelo Cardinal Sodano, PM
HONDURAS: President Carlos Roberto Flores
HUNGARY: President Ferenc Madl
ICELAND: Prime Minister David Oddsson
INDIA: Prime Minister Atal Behari Vajpayee
INDONESIA: President K. H. Abdurrahman Wahid
IRAN: President Mohammad Khatami
IRAQ: Deputy Prime Minister Tareq Aziz
IRELAND: Prime Minister Bertie Ahern
ISRAEL: Prime Minister Ehud Barak
ITALY: Prime Minister Giuliano Amato
JAMAICA: Prime Minister Percival Patterson
JAPAN: Prime Minister Yoshiro Mori
JORDAN: King Abdullah II Bin Hussein
KAZAKHSTAN: President Nursultan A. Nazarbayev
KENYA: President Daniel Toroitich arap Moi
KIRIBATI: President Teburoro Tito
KOREA-SOUTH: President Kim Dae-jung
KOREA-NORTH: Kim Yong-nam (designated head of state,
Presidium Chairman of Supreme People's Assembly)
KUWAIT: Sheikh Jaber al-Ahmad al-Jaber al-Sabah
KYRGYZSTAN: Mr. Muratbek C. Imanaliev
LATVIA: President Vaira Vike-Freiberga
LEBANON: Chief of the Lebanon Delegation Selim Tadmoury
LESOTHO: Prime Minister Pakalitha Mosisili
LIBYAN ARAB JAMAHIRIYA: Mr. Abdurrahman Mohammed Shalghem
LIECHTENSTEIN: Prime Minister Mario Frick
LITHUANIA: President Valdas Adamkus
LUXEMBOURG: Deputy Prime Minister Lydie Polfer
MACEDONIA: President Boris Trajkovski
MADAGASCAR: President Didier Ratsiraka
MALAWI: President Bakili Muluzi
MALDIVES: President Maumoon Abdul Gayoom
MALI: President Alpha Oumar Konare
MALTA: Prime Minister Edward Fenech Adami
MARSHALL ISLANDS: President Kessai Note
MAURITANIA: President Col. Maaouya Ould Sid' Ahmed Taya
MAURITIUS: Prime Minister Navinchandra Ramgoolam
MEXICO: President Ernesto Zedillo (President is now Vincente Fox)
MICRONESIA: President Leo A. Falcam
MOLDOVA: President Petru Lucinschi
MONACO: Crown Prince Albert
MONGOLIA: President Natsagiyn Bagabandi
MOROCCO: King Mohammed VI
MOZAMBIQUE: President Joaquim Alberto Chissano
NAMIBIA: President Sam Nujoma
NAURU: President Bernard Dowiyogo
NEPAL: Prime Minister Girija Prasad Koirala
NETHERLANDS: Prime Minister Wim Kok
NEW ZEALAND: Prime Minister Helen Clark
NICARAGUA: President Arnoldo Aleman
NIGER: President Tandja Mamadou
NIGERIA: President Olusegun Obasanjo
NORWAY: King Harald V
PAKISTAN: Chief Executive Gen. Pervez Musharraf
PALAU: President Kuniwo Nakamura
PAPUA NEW GUINEA: Prime Minister Sir Mekere Morauta
PARAGUAY: Vice President Julio Cesar Franco
PERU: President Alberto Fujimori
PHILIPPINES: President Joseph E. Estrada
POLAND: President Aleksander Kwasniewski
PORTUGAL: Prime Minister Antonio Guterres
QATAR: Sheikh Hamad bin Khalifa al-Thani
ROMANIA: President Emil Constantinescu
RUSSIA: President Vladimir V. Putin
RWANDA: President Maj-Gen Paul Kagame
ST. KITTS AND NEVIS: Prime Minister Dr. Denzil Douglas
ST. LUCIA: Prime Minister Kenny D. Anthony
St. VINCENT AND THE GRENADINES: Governor-General Charles
Antrobus
SAN MARINO: Maria Domenica Michelotti and Gian Marco
Marcucci (heads of state, captains-regent)
SAUDI ARABIA: Crown Prince Abdullah bin Abdul-Aziz al-Saud
SAO TOME AND PRINCIPE: President Miguel Trovoada
SENEGAL: President Abdoulaye Wade
SIERRA LEONE: President Ahmad Tejan Kabbah
SINGAPORE: Prime Minister Goh Chok Tong
SLOVAKIA: Prime Minister Mikulas Dzurinda
SLOVENIA: President Milan Kucan
SOLOMON ISLANDS: Prime Minister Manasseh Sogavare
SOMALIA: Abdiqassim Salad Hassan
SOUTH AFRICA: President Thabo Mbeki
SPAIN: Prime Minister Jose Maria Aznar
SRI LANKA: The Honorable Lakshman Kadirgamar, Master of Parliament, Foreign Minister
SUDAN: President Lt-Gen. Omer Hassan al-Bashir
SWAZILAND: King Mswati III
SWEDEN: Prime Minister Goran Persson
SWITZERLAND: President Adolf Ogi
TAJIKISTAN: President Emomali Rakhmonov
TOGO: President Gen. Gnassingbe Eyadema
TONGA: Prime Minister Prince 'Ulukalala Lavaka Ata
TRINIDAD AND TOBAGO: Prime Minister Basdeo Panday
TUNISIA: President Zine al-Abidine Ben Ali
TURKEY: President Ahmet Necdet Sezer
TURKMENISTAN: President Saparmurat A. Niyazov
TUVALU: Prime Minister Ionatana Ionatana
UGANDA: First Deputy Prime Minister Eriya Kategaya
UKRAINE: President Leonid D. Kuchma
UNITED KINGDOM: Prime Minister Tony Blair
UNITED STATES: President Bill Clinton
URUGUAY: President Jorge Batlle
UZBEKISTAN: President Islam A. Karimov
VANUATU: Prime Minister Barak Tame Sope
VENEZUELA: President Hugo Chavez
VIETNAM: President Tran Duc Luong
YEMEN: President Ali Abdullah Saleh
ZAMBIA: President Frederick J.T. Chiluba
ZIMBABWE: President Robert G. Mugabe
PALESTINIAN AUTHORITY: President Yasser Arafat
Not attending:
IRAQ: Saddam Hussein
LIBYA: Muammar Gaddafi
NORTH KOREA: Kim Jong-il
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