Jeralyn over at Talk Left reminded me of this article:

Fitzgerald eventually subpoenaed or otherwise demanded grand jury testimony from at least five reporters, including Pincus, two of whom had written about the Plame case relying on conversations with confidential sources. All but one of them agreed to give limited depositions about their conversations with Vice President Dick Cheney's chief of staff, Lewis "Scooter" Libby after "the specified Executive Branch official" (Judge Hogan's phrase) formally waived their oral confidentiality agreements. In the case of Pincus, Libby's lawyer spoke to the journalist's lawyer to release him, because the reporter did not accept the waiver idea in the first place.

As for Novak, it is not known if he was subpoenaed or if he has testified. However, it is widely believed by reporters and lawyers involved in the probe that he reached a negotiated "arrangement" with Fitzgerald -- and that he "sang."