There was a slight delay in release, but it's here now -- Take Arms, the side scrolling multiplayer shooter is now available on the Xbox Live Indie Games space.

"Play as three unique classes: the quick and light Striker, the slow and heavy Destroyer, or the middle-ground Grunt. Dominate three diverse locales and three game modes (DM, TDM, & CTF). Practice in solo mode against bots with multiple difficulty levels. Track your experience as you gain ranks and earn badges."

Check out the demo, or grab it for 240MSP.