I think this is great and I want the Zune to be very successful. But If you really want some good resources I recommend at least sitting back and watching this brilliant talk:
It's Luis von Ahn CMU Ph.D giving the talk and he's also the creator of the ESP game, Pickaboom, and others to demonstrate his research.
What's really going on here is that you want to improve search quality by using human workers for free. That should be what users know upfront. The site talks only a little bit about it and it's kinda buried.
Secondly, in designing this game, think about what Luis characterizes as "Games with a Purpose." More specifically the "Asymmetric/Symmetric Verification Games" concepts he points out. In fact, I would base this Zone Trivia game on these very principles. It will make the game fun and addicting plus better search quality between text and music.
~= Chris =~
Zune 80 (red) FTW!