According to Fox News, Robert Novak has indeed testified for the grand jury.
"Rove to Testify Again on CIA Leak" - Friday, October 07, 2005 By Jane Roh
"Cooper told the grand jury that he only learned Plame was Wilson's wife
after columnist Robert Novak named her in a column the week after Cooper
had talked to Rove. Novak has already testified before the grand jury and,
unlike Cooper and Miller, was never threatened with jail, prompting
speculation he cut a deal with prosecutors."
The CBS News web site supports this stance.
"Novak said his sources were two senior administration officials. Rove
spoke to Novak about Wilson's wife and is apparently one of Novak's sources.
The other is still a public mystery. Novak is believed to have cooperated
with Fitzgerald's investigation, though he has declined to comment."
The "Radar Online" web site speculates on what Mr. Novak might have told
the grand jury.
"While some have suggested Miller?who never wrote a word about CIA spook
Valerie Plame?was dragged into the leak probe when her name turned up on a
White House call log, several beltway insiders close to the investigation
say special prosecutor Patrick Fitzgerald learned of Miller?s involvement
from Novak himself."
If you need any clarification, please feel free to ask.
Google search on: "Patrick Fitzgerald" Novak testified
Looking Forward, denco-ga - Google Answers Researcher