I've just released a new version of SoLoud, a free, easy to use, portable c/c++ audio engine for games.
Downloads and plenty of documentation can be found at:
Basically I was looking for an audio solution, and the free ones I found lacked features I needed, and the commercial ones, well, are commercial. So I figured it can't be too difficult and rolled my own. And then kept working on it. The current release has been under construction for about four months.