Sanyo eneloop Mobile USB Booster for iPhone, iPod, PSP, Cell Phones and All USB Powered Devices
The Sanyo backup battery doesn't charge a bunch of USB devices, as noted by others. In my case, I picked up a Kensington 5 to 6 volt adapter for my Nokia devices. The battery is powerful enough to turn the adapter on, but not powerful enough to charge the Nokia devices.    Even worse, its voltage sags when the charge goes low. This kills some devices, in particular the HTC Dream (T-Mobile G1).