World of Tanks is coming to the Xbox 360.
UPDATE: Beta No Longer Available
Mainstream
Mainstream and AAA Alpha and Beta tests.
DAWNGATE, BETA
Another new MOBA, made by waystone games, features community driven content and story
UPDATE: Beta no longer available
FIREFALL, OPEN BETA
Futuristic MMO with Skill based combat. Like Defiance, but better looking.
UPDATE: Beta No Longer Available