Prison in this life for what he's done to America and the eternal lake of fire* in the next for what he's done to Iraq.
In reality, though, come January 20, 2009 he'll smirk his way out of the White House and into a plush life in Dallas. I hope the next president will be a Democrat, and I assume that Democrat will be either Obama or Clinton, but what are the chances that the next president will order a full, aggressive investigation of the Bush Administration's evildoing? What are the chances that Dubya will ever suffer anything for what he's done?
* I'm an atheist, but I fully understand the appeal of that idea.