SunLeaf Solar has introduced the USS$165 SunLeaf Pro (http://macte.ch/s9VfQ), an USB-based solar charger that plugs into an electronic gadget like the iPad or iPhone and can fold up to an eighth of its size.
In ideal conditions, the SunLeaf Pro is purportedly capable of fully charging an iPad in under seven hours. An iPhone would charge fully in under three hours.
The optional battery allows you to store energy so you can use your iPad during the day and recharge at night. Although it was designed for the iPad, all electronics that charge through a USB port are compatible with the SunLeaf Pro thanks to the included USB voltage controller.