The Extradition Treaties states that one of the many things you can be extradited for is "unlawful imprisonment".
Realizing that, I figure the world community at large could request to have say Bush and/or Obama extradited for the things going on in Guantanamo.
Of course they might object that these fellows enjoy diplomatic immunity and that it's completely ludicrous.
But if this incident has shown us anything I believe it's that US & Friends really don't care much about such minor details.