USBCell AA Rechargeable Batteries
What it is: USBCell AA Rechargeable Batteries look and act just like normal AA batteries, but when they're out of juice you merely plug them into a USB port to recharge.
Why it's awesome: With USB ports available on most devices these days, you'll always be close to a charger. USBCell says that its batteries can survive hundreds of reuses too, saving you money and hassle.
Where to buy: USBCell