a physics contest would be nice.

at the time of the first physics contest only pro users had access to the physics engine and newton wasn't around. now everyone can use the internal physics engine or newton so there should be many great entries.
or a level design contest for levels which use the ABT features and the new map compiler but i am not sure when the new map compiler will be 100% done?
or a "replace the old warlock (and so on) characters with something more modern (bone animations,...)" contest.