Linked of below is the GiantBomb.com's quick look at the Xbox Live Arcade title Shadow Complex.  Now I have to admit I was not interested at all in this title until I watched the quick look.  This game was one of the starts of the recent E3 conference where it earned comparisons to Metroidprime and Castlevania.  The game is a 2D side scroller where you play a "regular guy" and accidentally discover a conspiracy to overthrow the US government.

Watch the quick view of the start of the game and check out the game when it comes out on August 19th.  The game is developed by Chair which is a studio owned by Epic, the creaters of Gears of War.  This game is 2D but looks incredible and it clearly using the most recent Gears 2 game engine.