I think it's not impossible that the Bush administration knows where he is. Or that he's dead. Seems unrealistic? Well, think about it...
1) As long as Bin Laden hasn't been caught, he's Bush's all access pass to the Middle East. Ever since Bin Laden came into the picture, Bush has been able to do whatever he wants in the Middle East in the name of the War On Terror.
2) Bin Laden has one of the most famous faces in the world. The USA with it's mighty FBI and CIA and the world's most powerful army has been looking for him for six whole years. And still no trace of the guy. I find that hard to believe.