I have benn SOOO planning to do an exercise bike generator for a while.
I finally got my wife a nice, used, recumbent exercise bike. She really has been enjoying it so far - Which means it's time to Mod it!
I also happened to buy it for her the day before I bought the Mercedes for my bio-diesel truck conversion....
I know of a couple of people at an ecology group who seriously are interested in an exercise bike generator to run a laptop or two at their office. I figured I would experiment with mine at home to come up with a decent design, but it looks like you beat me to it!!!