According to the Detroit Free Press, the hottest rumor is that Saddam made a deal with the U.S. months ago to get out of Iraq safely. This smells of conspiracy theory, but it's a fun one (and just about as plausible as anything else right now).
It'll be interesting to see how strong this rumor gets. The strength wouldn't necessarily indicate that there's any truth, but it would indicate even more distrust of the American government.