Wherever they find him... a bullet shortly afterwards.
No fanfare, no publicity.. just dead.
Easymo's Alliance solution is neat.. as long as there is no chance of escape or subversion of the 'trial'... still; it puts what may be a dangerously pre-mature 'end' to the perceived war on terror onto the table. OBL ain't the entire network, or the entire focus of 'War on Terror'
He may be worth more to us soon 'fictionally alive' than dead... as long as he is 'out there' in the public's mind we will not have much difficulty in maintaining the 'anti-terror' stance internationaly or domesticly. Dead, everybody just sighs a BIG sigh of relief, and the "War on Terror' becomes over in the public's mind.
So; my optimum solution.. Find him; kill him; shut up about it.