Last night I heard this story on the bbc about "video" games for the blind. Apparently they involve having to locate enemies in the stereo spectrum and attack them in the proper direction using the arrow keys (for example). I thought that this would be a great tool for engineers and recording musicians to do some rigorous ear training for stereo field locating and close listening. Also, they could be good for getting to know a new set of speakers or headphones. It seems this is the main page for finding these games. Here is a free one. I haven't found one yet for Mac, but would like to.