Ok, so Osama needs artificial Kidneys to live, correct? There are only two places in the world that make them, one in the USA and the other is in Switzerland. Find some kidneys going to the Middle East area, put a homing device in it, track him down, snipe.
Or you can put a explosive in the kidney. Whichever floats your boat.
I think Osama Bin Laden isnt even the leader of the terroist rings. He is probably a figurehead, like his equilly menacing counterpart, the queen of england. Dont ask where this came from. The Queen would eat me if she found out.
This isn't as easy to do as it sounds. What about a swap or a mix up? What if the terrorists find out and make it back fire? Remember, in war, nothing goes according to plan.