Looks like Steam has a couple of good weekend specials running, as usual. Try out the successor, spiritual or psychic maybe is a better word, to Painkiller (one of my all time favorite FPS games) for free this weekend. It’s called Dreamkiller and has been described as a combination of Doom, Psychonauts, and Bioshock. Also they’ve got a new side-scroller type demo available that reminds me of Time Pilot, called Altitude.