I signed up. Can't promise I'll participate in any NES competitions, though- my experience with FCEUX has been less than awesome...
Anyway, I had an idea for another contest that I think more people will take an interest in: a "cooperative bot" competition, for a beat-em-up. The goal would be to reach the end of the game; the bot that gets closest to defeating the last boss wins, with high score being the tiebreaker.
The contestants don't know in advance which bots will be paired up with which, and in that way the challenge is intended as an example and/or application of the
Prisoner's Dilemma. If you treat your partner as an enemy and cause him to die, you lose his assistance and may not get as far as you would have otherwise. Conversely, the other guy may try to metaphorically kick you down some stairs when you're not looking.
What do you do? I can imagine lots of different approaches; myriad strategies and counter-strategies, like the war between spammers and the civilized world. It tickles my brain to think about it.