I’m behind the game on this one, but Derek “Tigsource and Aquaria” Yu has pre-released a game called Spelunky, and it’s the best roguelike I’ve ever played. Yu bills it as a cross between La Mulana and Nethack, but it’s fairer and more fun than either. The procedurally-generated levels and swift death is balanced by an incredible depth that has helped me finally grok what the whole roguelike thing is all about.