Like Mitch, Superfan on PPoT: Bupkis.
I got a nice haul for taking part in the Hardball Hot Seat in 2002--a nice Hardball shirt which is 3 sizes too small, a Hardball baseball cap, an MSNBC satchel, and a signed copy of Chris Matthews' most recent book. For making the (unaired) finals, besides a trip to DC with a guest, I got a $200 AmEx gift card and a fancy at the time digital camera/MP3 player hybrid.