Too much effort for not enough of a return, al-Qaida is better off without him when you think about it; they now have a world famous martyr that they can say was denied his rightful place in heaven by being buried at sea by heathens, despite the fact that the whole reason he was buried at sea with such haste was that Islam calls for dead people to be buried w/in 24 hours, and no muslim nation would allow him to be buried in their borders.
In the grand scheme of things, the only person this whole dead OBL thing is going to help will be Obama, who'll be able to claim that he was responsible for the death of Osama come next election cycle. The terrorists will keep on plotting to kill "heathens" and the rest of the world will have forgotten about this in about a week and a half. Also, as much as I enjoy Bush bashing, even he had the common human decency to not put a rotting head on top of a flag pole; now if the White House had ramparts that be a different story, that's what they're made for after all, but not a flagpole. :p