I followed Jainie's instructions, and made my own USB charger. It only took 15 minutes. Sorry, I forgot to take a picture of everything before I started, and since I have some heat shrink tube covering the soldered bits, you can't see how it is wired. Just watch the video linked above.
This is the finished USB charger.
Closeup of the part I made (7805 regulator and USB connector).
I tested it out on my cell phone and my iPod and it worked for both. So rad, and so easy!