Well this week the only game release that anyone is going to be interested in is the excellent Limbo, which I highly recommend picking up.
Apart from that there are a few demos and some new Mortal Kombat DLC for you to sink your teeth into.
Limbo [Full Game and Demo]
Fast Draw Showdown
Dead Block [Full Game and Demo]
Final Fantasy Tactics: The War of the Lions (PSP)
Mortal Kombat DLC Rain Character Add-On & Compatibility Pack
Fallout New Vegas: Old World Blues
Dissida 012 [duodecim] Final Fantasy DLC
The King of the Fighters 95
Baseball Stars 2
Me Monstar: Hear Me Roar
Sauke vs Commander Athena