Grabbed a few games recently and been swapping between them.
Spelunky - Just came out recently on Steam, brilliant game but god is it frustrating! Bought a xbox controller just for it as playing with the keyboard gave me a slight aneurysm.
Rogue Legacy - Another good little indie game, hack and slash your way throug the randomly generated levels to your heart's content!
Path of Exile - Been playing this for ages and always end up coming back to it (especially since I seem to die every week on Hardcore). Best ARPG going in my books.
Been keeping an eye on Space Hulk, released tomorrow, looks fun so that'll probably keep me going till the end of the week too.