Check this out:
http://www.thinkgeek.com/gadgets/electronic/b716/Crank powered shaving apparatus

Taken from site:
The Freedom Dynamo Electric Shaver provides true liberty through its Wind 'N Go lever, avoiding any need to use actual electricity. One minute of winding, and you've got yourself enough power for a full shave! It also comes with three individual heads that properly flex and rotate to provide a close and precise performance. And for any on-the-go users, it comes with a travel case, which includes a mirror, cleaning brush and adapters (as noted below). We'll have to insist that you provide the hair, however. Sorry!
I had a feeling something like this was coming along. Good idea if it works. I haven't had the best of luck with the rotary blades myself.
Interesting! I'm curious how it works relative to other electric shavers.