As I've been telling (annoying?) my friends about the whole Rove situation, it's just part of a larger picture on the Bushes whole Iraq War policy. Any information that didn't fit their point of view (ie: Iraq has WMD and works with Al Queda) they disregarded. And anyone who disagreed with them on anything, they smeared/slammed. Wilson and Plame are just part of a larger group of people, including Paul O'neil, Richard Clarke and Dick Durbin, that have been taken to the woodshed by BushCo.
Anyways, Frank Rich (and Americablog) talk about it better than I do.