Idea: Large-scale cracking contests as a sport.
You have an attack team and a defense team. There's some kind of system (Web site, application, database, email, whatever) that is the focus of the whole thing.
The defense team gets a few hours to harden the system, then the attack team gets some time to try to break in and achieve one of several objectives. The attackers get more points the more they accomplish (theft > destruction > DoS). The defenders get more points the longer they hold out.
@alexbuzzbee we get the sense that cracking might not lend itself well to typical tournaments. namely, we are under the impression that systems are most likely to be insecure when they've grown very large, and also that breaking into them can take weeks or more. unless you imposed heavy constraints on the competition, a single match could last months or years.
@diodelass Yes, the whole tournament would take several months to complete. It's certainly a slower thing than most games, but I think it would still be interesting.
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