Very interesting. I would not be surprised if Wilson and Plame "leaked" the info to six friendly reporters themselves. I tend to think they used an intermediary to approach Novak, though, because Novak's description of his source as "no partisan gunslinger" doesn't seem to me to fit Wilson. Apparently there was more than one source spreading the information around. One of Novak's articles describing his source as "a senior administration official" also says that Clifford May had heard the same information from "a non-government source", which May's own article describes as "someone who formerly worked in the government".
Maybe, maybe not- remember the first media reports about Wilson? The early ones tried to paint Wilson as a conservative, a Bush voter.
Wilson formerly worked in the government - he was, at the time, a former US ambassador. There's also the CIA guy Beers in the mix somewhere.
Beers also signed the democratsabroad.org letter by Kerry on Iran policy- with former Amb Wilson --- http://www.freerepublic.com/focus/news/1074047/posts?page=151#151