The Pedal-A-Watt Stationary Bicycle Generator (http://www.econvergence.net/electro.htm) sells a PowerPak (Bike stand, 600 watt-hour battery and inverter).
Windstream (http://windstreampower.com/)
K-Tor (http://www.k-tor.com/)
and Pedal Power Generator (http://pedalpowergenerator.com) manufacture small power generators which can be pedaled or cranked by hand.
ReRev (http://rerev.com/) retrofits gym equipment of aerobic exercise and converts it into productive electrical energy that feeds into the building’s electrical system.
