Amidst all of the media hyperventilating over the Bush "leaks," the WaPo actually has a sensible editorial today. The post title is its first three words:

Mr. Wilson subsequently claimed that the White House set out to punish him for his supposed whistle-blowing by deliberately blowing the cover of his wife, Valerie Plame, who he said was an undercover CIA operative. This prompted the investigation by Special Counsel Patrick J. Fitzgerald. After more than 2 1/2 years of investigation, Mr. Fitzgerald has reported no evidence to support Mr. Wilson's charge. In last week's court filings, he stated that Mr. Bush did not authorize the leak of Ms. Plame's identity. Mr. Libby's motive in allegedly disclosing her name to reporters, Mr. Fitzgerald said, was to disprove yet another false assertion, that Mr. Wilson had been dispatched to Niger by Mr. Cheney. In fact Mr. Wilson was recommended for the trip by his wife. Mr. Libby is charged with perjury, for having lied about his discussions with two reporters. Yet neither the columnist who published Ms. Plame's name, Robert D. Novak, nor Mr. Novak's two sources have been charged with any wrongdoing.

As Mr. Fitzgerald pointed out at the time of Mr. Libby's indictment last fall, none of this is particularly relevant to the question of whether the grounds for war in Iraq were sound or bogus. It's unfortunate that those who seek to prove the latter would now claim that Mr. Bush did something wrong by releasing for public review some of the intelligence he used in making his most momentous decision.

Why isn't Novak facing a prison sentence over this?

Not really relevant to your post, but the title reminded me immediately of ">this.

once again, wilson never said cheney asked him to go to niger. wilson said cheney's office made the original request to the cia (which is true). even if he had said that, libby didnt need to out plame to refute it. also, im under the impression that the investigation is still ongoing.

wilson never said cheney asked him to go to niger

He very clearly implied it, in order to buttress his own credibility (something that in retrospect he needed very badly to do).

He did say it, when he was still wearing his ninja mask for kristoff.

He, didn't attribute himself as the actual person, while being the source of an article saying that "at the request of the vice president" and "reported to the vice president"

Read Mac Ranger, and AJ, they obsess over this stuff.