Phil Spencer, the Head of Microsoft Studios, mentioned on Twitter that the first two ID@Xbox games will be Nutjitsu (see the launch trailer above) and a game in the Worms series (most likely the recently announced Worms: Battleground). Nutjitsu is already available on Windows Phone; however, there’s not much known about the Worms game.
ID@Xbox is Microsoft’s self-publishing program, a smart move on their part to try to catch some of the indie game market. According to IGN, the first ID@Xbox games (including Nutjitsu and the Worms game) are set to come out in March.