This is a slick, small music player app that sort of illustrates energy choices with music as a vehicle. You can choose between nuclear and wind energy to power your music. A free music track by Ryuchi Sakamoto (YMO member) is included.
You also can play individuals tracks of your choosing in your music library, or with an Apple script, play from an iTunes playlist. I wasn't able to get the playlist to work correctly - it seemed to only play the first track in the playlist.
I was unable to see animations from the 'nuclear energy' option, other than the steam from the reactor. You are supposed to see some sort of decaying desktop. Perhaps it doesn't function with background photos as desktop images, as I have on my system. Or it takes hours to happen.
The wind energy option is interesting, and requires you to blow (make exhale noises) into your mike to get any power.
As an education medium, this doesn't do a very good job of illustrating the energy issues, and oversimplifies it. In reality, nuclear wastes have effects, but they aren't visually obvious. And comparing wind to nuclear energy doesn't convey a sense of the other options available like fossil fuels and solar. A solar option could be implemented by varying power according to the light that hits your iSight. The fossil fuel option could cause your desktop to get sooty.
Let's hope in version 2, they'll add these things or at least fix the problems I encountered.