http://community.livejournal.com/always_overtime/ It's planned to be a Pan-Fandom Team Fortress 2 experience, but since it's still in the pre-production stages, this is your chance to give (serious) concrit about the rules and setup. I'd like to launch sometime in January of next year, give or take Valve Time, so volunteers are very welcome.
Overtime has launched. It's ridiculously easy to join, both because it's new and because everybody has to start practicing their pretendy fun times somewhere.