I would like to sit him down opposite Bush and play moderator while they discuss their respective differences. Afterall, Osama's not to blame, its societies fault.
Perhaps we can put him in a room with 2 or 3 protestors and a gun. Maybe the protestors will be able to convince him that its ok to be angry and hes not as bad a person as everyone thinks he is. Do you think they will be able to voice their opinion that the US deserved 9/11 before he shoots them all because they're Americans?
Afterall, lets be reasonable. Osama has led a very tough life, what with the profits from selling oil to Americans, and its only right for his inner child to want to smash things (like sky scrapers) in order to vent his frustration - its healthy.
Perhaps we should ask him what it is he wants? What would make him happy? Im sure hes a reasonable man. Given the choice between the destruction of major US cities and peace on Earth, Im confident he'll let the doves fly.
You want a trial for show? Fine. Hang him afterwards.