Thanko’s USBACH01 allows you to charge any USB-powered gadget without the need for a computer. Best of all, it’s priced at a very affordable $11. Product page here. No word yet on availablity.
…you’re no doubt aware of the endless stream of devices that either charge up, or work only when connected to a USB port. The problem with that is that a USB port is usually tied up to a computer, and there’s a decent chance the computer is not with you at all times