The letter was finally signed by 60 ex diplomats. The full text of the letter can be found
here. The signatories seem along the same line as the British, full of people with
wide and varied experience in the Middle East. They include (can�t find a full list yet):
Andrew I Killgore, Ambassador to Qatar, 1977-1980.
Richard H Curtiss, former chief inspector, US Information Agency.
Colbert C Held, Retired FSO and author.
John Gunther Dean, former Ambassador to India.
Thomas J Carolan, Counsel General Istanbul, '88-'92.
C Edward Bernier, Counselor of Embassy, Information and Culture, Islamabad, Pakistan.
Donald A Kruse, American Consul in Jerusalem.
Ambassador Edward L Peck, former Chief of Mission in Iraq and Mauritania.
John Powell, Admin Counselor in Beirut, '75-'76.
John Gunther Dean, last position held US Ambassador to India.
Greg Thielmann, Director, Office for Strategic Proliferation and Military Affairs, Bureau of Intelligence and Research.
James Akins, Ambassador to Saudi Arabia.
Talcott Seeyle, Ambassador to Syria.
Eugene Bird, Counselor of Embassy in Saudi Arabia.
Richard H Nolte, Ambassador to Egypt.
Ray Close, Chief of Station Jeddah, Saudi Arabia 1971-1979.
Shirl McArthur, Commercial Attache, Bangkok.
Thomas J Scotes, Ambassador to Yemen 1975-1978.
Robert V Keeley, Ambassador to Greece.
Edward RM Kane, CIA Deputy Chief of Station in Iraq.
The BBC has an article with some good points on why Bush is likely to ignore the letter:
BBC
The influence of the current State Department on the Bush administration is debatable. The influence of former diplomats is minimal.
And the writers of the letter have a problem in that several of them are connected to a lobby group active in Middle East affairs, often as a voice
for the Palestinians.
Another problem is that there are so far few big names on the list of signatures. Washington is a city which likes big names.
Hopefully the public impact of the letter won't be as minimal.