Club UFC - A UFC focused forum. - http://clubufc.com
Mixed Martial Arts Forum - Mixed Martial Arts (MMA), Muay Thai Kickboxing, grappling, and Brazilian/Gracie Jiu-Jitsu (BJJ) forum. - http://www.mmaportal.com/
MMANews.com Forums - Talk UFC, PRIDE, K-1, and related events. - http://forums.mmanews.com
MMA Forum - Discussion forum for Mixed Martial Arts, including the UFC, Pride, Muay-Thai and K1. - http://www.mmaforum.com
Fight Forum - Forums on boxing, UFC, Pride, K-1, and other MMA promotions. - http://www.fightforum.com/
Mixed Martial Arts Community - Forums concerning MMA, Boxing, Kickboxing, and related topics. - http://www.mmafighting.net
Underground Forum - Largest MMA forum with sub forums on Judo, Sambo, conditioning and weapon training. - http://www.mma.tv
Fightsport - Various MMA forums. - http://www.fightsport.com