My iPod Touch was dying and I didn't want to turn my laptop on just to charge it. But then I thought of an old laptop charger I had that was still good, so I got to work. And so I have hacked together an USB charger.
Step 1: List of things you need
three alligator test leads
USB car charger
Old laptop charger: 20V max, 1.5A is reasonable
DMM ( optional)