According to a WikiLeaks member, they publish all true and false documents together with a judgment whether they think it's true/false and why. For example, they published a fake Steve Jobs medical report together with a note why they considered it a fake. They do have criteria (e.g. no self-made write-ups, no publically available documents), but nothing against boring or false stuff.

http://blog.chaosradio.ccc.de/index.php/2009/08/24/cr149-wik... (if you understand spoken German, that is)