I also picked this up the other day. I already owned Psychonauts on the Xbox but getting a cheap copy to play on my PC wasn't a problem for me, especially since it's slightly glitchy when you play it on Xbox 360.
Finished Limbo last night. What a beautiful-looking game. Played very nicely although a couple of the puzzles late in the game weren't as intuitive as the earlier ones in terms of knowing what you could interact with.
Bastion is also gorgeous and charming. Sword and Sworcery...it's interesting, I'll give it that. The particular control scheme made more sense to me when I read that it was initially released for the iPad/iPhone. I'm saving most of Amnesia for later but what I did play was wonderfully creepy.