We should all play Counterstrike.
It is really perfect for a forum type deal. The original is only 9.99 on steam and it is much older now so any computer in the last 10 years will run it fine, lol. Source is much better as in quality but 1.6 is just much better in game play and custom maps. Shit I could even build us a custom UF map.
www.steampowered.com baby!