I've updated the list to include Glenn Kessler, a Diplomatic Reporter for the Washington Post, who was reportedly interviewed by the FBI in connection with the leaks.
The reference to Kessler was found in the following NYT article:
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http://www.nytimes.com/2005/07/28/politics/28leak.html>
Here's a new update of the Rove case's witnesses and interviewees
The update was prompted by new revelations in the Washington Post and MSNBC. The WP reports confirm that John McLaughlin, Bill Harlow, Carl W. Ford, Jr. and an unnamed friend of Wilson's have testified before the grand jury. The WP reported that George Tenet had been interviewed but it was unclear if he had actually testified before the grand jury. The MSNBC report confirms that John Bolton testified before the grand jury.
This list is something I've put together from my Googling. If anyone has any additions or corrections, let me know. I'll post the list from time to time in the future as further information comes in.
Persons Reported to Have Testified before the Grand Jury:
John Bolton-Former Assistant Secretary of State and UN Ambassador nominee
Bill Harlow – Former CIA spokesman
John McLaughlin- Deputy CIA Director
Friend of Wilson’s (Name Unrevealed) - Met with Novak in the street
Carl Ford, Jr. –Director of State Department Bureau of Intelligence and Research
Alberto Gonzales – Former White House Counsel and now Attorney General
Karl Rove – Deputy Chief of Staff in Charge of Policy for the President
I. Lewis “Scooter” Libby - Chief of Staff for the Vice-President
Colin Powell – Former Secretary of State
Karen Hughes – Senior White House Aide
Ari Fleischer – Former White House Press Secretary
Scott McClellan – Current White House Press Secretary
Claire Buchan – Deputy White House Press Secretary
Adam Levine – Former White House Communications Aide
Mary Matalin – Former Advisor to the Vice President
Tim Russert – Host of “Meet the Press” MSNBC
Matthew Cooper – Time Magazine
Walter Pincus – Washington Post
Andrea Mitchell – Reporter MSNBC
Persons Who Refuse to Say if They Have Testified before the Grand Jury:
Robert Novak – Reporter for the Chicago Tribune
Persons Subpoenaed to Testify before the Grand Jury but Refused to Testify:
Judith Miller – New York Times
Persons Interviewed by Patrick Fitzgerald (But Not under Oath)
George W. Bush – President of the United States
Richard Cheney – Vice-President of the United States
Persons Reportedly Interviewed by FBI and Who Also Testified before the Grand Jury:
Karl Rove - Bush's Former Senior Adviser and Present Chief of Staff
Scott McClellan – White House Press Secretary
Mary Matalin – Former Advisor to the Vice President
Adam Levine- Former White House Communications Aide
Ari Fleischer – Former White House Press Secretary
I. Lewis "Scooter" Libby - Chief of Staff for the Vice-President
Persons Interviewed by the FBI but not known to have testified before the Grand Jury:
James Guckert a/k/a Jeff Gannon a/k/a "Bulldog" - Talon News
Dan Bartlett – White House Communications Director
Cathie Martin – Aide to the Vice-President.
George Tenet - Former CIA Director
Glenn Kessler – Diplomatic Reporter for the Washington Post
Unconfirmed:
Andrew Card
Condoleezza Rice
Stephen Hadley
Joseph Wilson
Elliott Abrams
Michael Ledeen
David Wurmser
Richard Armitage