Human Power Stations

Here's a company that sells human power generators
http://www.windstreampower.com/humanpower/hpg.html

There's always Freeplay and they have a "FreeCharge Marine Power Pack" that's "available soon"
http://www.freeplayenergy.com/index.php?section=home

And this company, Dynosys, seems to have optimized the wheel-rim generator
http://www.dynosys-ag.ch/indexe.html