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I found this great instructable about hacking dynamo keychain flashlight into a nice 5v power supply. They use a MAX756 step-up DC-DC converter and a few other parts to get it all working. This looks like a really interesting idea for remote applications where power isn’t readily available or a solar panel would be too bulky or fragile.

Now you can have a regulated power supply constantly at your fingertips with NO batteries to replace or recharge! This Instructable shows you how to modify a keychain dynamo flashlight into a lean mean supply that can replace batteries for any projects requiring quick 5 volt direct-current (5V DC) power.

More about making a Battery-free 5 volt project power

In the Maker Shed:
Makershedsmall
Mkad2-2
MintyBoost USB Charger Kit v1.2 – Build your own MintyBoost: a small & simple (but very powerful and very MAKE-like)USB charger for your iPod (or other mp3 player), camera, cell phone, and any other gadget you can plug into a USB port to charge.