This article is an interesting synopsis of other writers in the last pages.
Cooper's last minute story turns out to be an exaggeration - he had the same waiver from Rove as he had before. So, maybe he's trying to save face, or he plans only to talk about Rove. Could go back to the clink if he tries that.
The latest news reports indicate that Rove is the source who Cooper was trying to protect until last week -- and that Rove tipped Cooper about Plame three days before Robert Novak published his now-famous column exposing Plame's identity.
There is an issue with the chronology here. Wilson's book mentions that a week before Novak's article came out, he heard from a friend that Novak was going around telling people, "Wilson’s an [expletive deleted]. The CIA sent him. His wife, Valerie, works for the CIA. She’s a weapons of mass destruction specialist. She sent him." If Wilson's statement is accurate--always a big "if" with Joseph Wilson--Novak had already spread this information around Washington several days before Rove talked to Cooper. Therefore Rove's conversation with Cooper proves nothing about Novak's source.