leet_x1337 said:
I'll just point out, like others, that you really should buy the Humble Bundle.
http://www.humblebundle.com/
By the way, Terraria and Amnesia. Well worth it. I don't think I've seen anyone mention Chime and Torchlight, so check them out. Magicka has been mentioned above, but I just want to say that I had a lot of fun with it even in single player, so I'd recommend that whether you know someone who has it or not. Oh and if you like Adventure games, Jolly Rover is pretty cool. I'm not sure how much Majesty counts as an indie game, but it's a great game and it's only $5 on Steam so go for it.
EDIT: Forgot, if you're a fan of Turn-Based Strategy, get Greed Corp. Good fun.