Would anyone be interested in "Hacking Games"?
jlees: Another context where you can take part in sandboxed, organised hacking contests -- sort of -- is some ARGs (alternate reality games). I've not seen anything recent that involved true hacking skills, but sometimes there can be some wonderfully fun puzzles (you know, beyond guessing that a fictional character's password is the name of their fictional pet). Laying the trail for these is also fascinating work.