So who's the leaker? Current bet is...
Lewis "Scooter" Libby, Cheney's chief of staff. This blog is just one of several that have arrived at this conclusion.
Libby figures prominently in many Great Conspiracies. The old reliable screwball Lyndon LaRouche in particular has a lot to say about him.
If it does turn out to be Libby, Novak will have a hard time explaining how Cheney's Chief of Staff is not a member of the Bush administration.