Here's a smartphone and tablet charger that doesn't look like a brick yet manages to charge a smartphone 3-5 times. The TP-Link 10400mAh Power Bank is surprisingly small yet can charge two tablets simultaneously. It features two USB ports, charges via a microUSB port and even has a clever built-in flashlight for emergencies. It is compatible with 5V input USB-charged devices.
The TP-LINK TL-PB10400 battery charger is now shipping and costs around $59.99.