The Greener Gadgets Competition sprouts a wireless cork mouse that needs no batteries, and a bicycle that charges up your iPhone with a 3 kilometre ride.
Corky the Mouse harvests the kinetic energy of your normal mouse movement use, no more batteries. You can vote for her here if you'd like. It would be interesting to see them applying the same logic to this...
And the RolgerGen, a nice lo-fi personal powerpack, check the specs here. Reminiscent of Future City Mobility and Hybrid2, though these guys are distinctly higher-fi.