I think no mention of debunking psychics is complete without a nod to James Randi http://www.randi.org/site/ and of course, Houdini, who debunked countless mystics by explaning their "magical" techniques. Sure, we can all point to Mythbusters and Penn and Teller, but some of those early guys did an amazing job of arming the public.
If we'd only listen. http://www.stubhub.com/john-edward-tickets/