I spend lots of time on the road and I have a few devices that can be charged with USB. My ipod Touch, my Android phone and my digital camera, these devices can be charged via a usb port. Since my office is my backpack, anything to shed weight is good.My "main" charger is from iGo. It's called the iGo Anywhere. What makes it better than a regular USB wall wart type charger is that it has a battery