Yesterday I started playing Rochard on the PS3. It's a scifi themed 2D platform/puzzle game with a heavy emphasis on the puzzle. You have a gravity gun that you use to manipulate objects, and as you progress you'll get the ability to manipulate gravity itself. It's pretty damned cool and follows the metroid-vania style formula for its gameplay. I have heard that it will be coming to the PC soon as well. If you haven't checked this one out and you own a PS3, you should give this one a look.

Oh, and it has a really catchy theme song.