Thanks for the tips.  I think I'm going to break out my old C primer and try my hand at a simple audio game for starters. I actually had never even heard of an audio game before the other day.  I downloaded a few different ones and was particularly impressed by Shades of Doom.  I also looked at the trailers for Sound Voyager, which seems quite interesting as well.  The idea of a sound only game is really intriguing to me, even as a sighted person.  The spatial effect that can be achieved in these games is actually quite amazing to me.  I wonder, has there been any audio games that utilize force-feedback technology like those used in some of the flight simulators?  I have a Microsoft Sidewinder Force Feedback Two joystick, and at least for flight simulators it adds a whole new dimension to the playability of a game.  It would be interesting to see this employed somehow into an audio game.