A neat little USB adaptor for the car cigarette
lighter. You may already have a USB charger for your phone or PDA, but that
needs a PC to work.
With this, you can use that cable to charge when in the car too.
It is a 12v - 24v unit, and outputs 1000mA, which is more flexible than most
of these I have seen.
1 X USB Car Charger Adaptor