A couple of days ago Braid was finally released on Steam. I bought it, played it and enjoyed everything about it: the puzzles, the art, and especially the story telling mechanic in the last level.
I had already decided to buy the game long before because Jonathan Blow always gives such good talks on game design, so I was more than happy to send money his way as soon as a PC version was available. Anyway, check the game out. A free demo is already out in the wild so you can it a whirl.