Looks like Libby is the one who leaked the name of Valerie Plame.

Libby will probably take the fall for Turdblossom.

I doubt if Libby acted independently. He is, after all, Rove's dog and it was an effort to take the heat off the administration and place the blame for faulty intelligence on the CIA.

From the NY Times:

"At that breakfast meeting, our conversation also turned to Mr. Wilson's wife. My notes contain a phrase inside parentheses: "Wife works at Winpac." Mr. Fitzgerald asked what that meant. Winpac stood for Weapons Intelligence, Non-Proliferation, and Arms Control, the name of a unit within the C.I.A. that, among other things, analyzes the spread of unconventional weapons.

I said I couldn't be certain whether I had known Ms. Plame's identity before this meeting, and I had no clear memory of the context of our conversation that resulted in this notation. But I told the grand jury that I believed that this was the first time I had heard that Mr. Wilson's wife worked for Winpac. In fact, I told the grand jury that when Mr. Libby indicated that Ms. Plame worked for Winpac, I assumed that she worked as an analyst, not as an undercover operative."