I don't always agree with Juan Cole, but I think his perceptions on the Karl Rove issue hit the nail on the head. Cole not only addresses the Plame/Wilson incident, but also points out how similar tactics were employed against retired General Anthony Zinni and former Treasury Secratary Paul O'Neil. (Cole points out that O'Neil blew the whistle on the Iraq war planning in January of 2001, and leaves it to us to figure out the significance of the date.)
I think everyone needs to keep in mind that Karl Rove is just one piece of a giant, sinister (yes, I said "sinister") puzzle. It's fairly clear that the plan to invade Iraq was concieved by the neoconservative Project for the New American Century no later than January of 1998. If we keep digging, we're going to find a lot of skeletons.