Ever since I first saw a trailer for the game "World of Goo" I've seriously considered buying it. At $20 though… it was slightly outside the range of what I was willing to pay for a PC game.
But, for the next 4 days, it's included (along with 4 other [awesome looking] games) in the "Humble Indie Bundle", which you can currently name your own price on. In addition to that, 100% of the price you choose to pay will be divided between the game developers, and charity (EFF and Childs Play).
Check it out at this link: Humble Indie Bundle
I'm planning on donating $15-20 once I get home.
World of Goo! Here I come!