We do pretty much every type of popular online game from StarCraft to Halo 2, but our primary communication is thru the forums and Xfire, so make sure you have Xfire.
Lately everyone's been doing Counter Strike:Source, but if you want to do a StarCraft match, just PM everyone.
I think it's because, most of the club is around our area, so during summer, most everyone's on vacation, and during school, it's easier for us to find routine times and schedule events better.