Tom Francis, game journalist extraordinaire and fledgling indie game dev, has been working on Gunpoint for a while now; I've had a chance to play the beta, it's definitely something special. He already put out a call for artist volunteers, and got some amazing results (as you can see).
A couple days back he put out a similar query for any interested composers, including a gameplay video people could pair their tentative soundtracks too. And once again, he's getting a pile of great responses- check out the comments on this page and hear it for yourself.
I'm just floored by how much good ambient music enhances this game's atmosphere. It's really something.