I've been playing around with the game for the past year or so, actually, but I was only recently (like, in the last month) able to actually make any serious progress in the game.
And it is Awesome.For those who don't know, it's what I think can be called the most complicated simulation ever devised, where you guide a group of dwarves in hollowing out the side of a mountain into an enormous fortress. It has an arcane control scheme the likes of which hasn't been seen since...well, I don't think it's ever been seen before. But once you get past that, the sheer amount of STUFF that got crammed in to the game is incredible. I highly suggest that you try it out.
Here's the download for the latest version:
http://www.bay12games.com/dwarves/And, if you're new to it, you are
definitely going to want to go through this guide (learning as you go is not an option with this game):
http://afteractionreporter.com/2009/02/09/the-complete-and-utter-newby-tutorial-for-dwarf-fortress-part-1-wtf/