My search for a state willing to prosecute US leaders for torture is apparently not without an answer. Spanish judge Balthazar Garzon – who else? - has started a criminal investigation into the suspected torture of detainees in Guantanamo Bay , saying he would target both US military personnel and those who issued their orders: http://english.aljazeera.net/news/europe/2009/04/2009429193945860316.html.
There are a couple of terrific articles on the practice of torture by Mark Danner in recent issues of the New York Review of Books, and these are apparently available on line: http://www.nybooks.com/articles/22530; http://www.nybooks.com/articles/22614
Thanks to Mercedes Melon and Joe Powderly.