Recharge your iPhone with an Altoid Tin
Ladyada.net:
This project details a small & simple, but very powerful USB charger for your mp3 player, camera, cell phone, and just about any other gadget you can plug into a USB port to charge! (See below for compatibility tests)
The charger circuitry and 2 AA batteries fit into an Altoids gum tin, and will run your iPod for hours!
I plan on making mine sometime this week. How about you?