How about a set of rechargeable batteries that can be charged in your USB port? ThinkGeek has a pair of USBCell recharbeable batteries that fit the bill. When your batteries are are going dead you simply pop the cap, and pop them into your USB port.
"Whether it's on your computer, laptop, monitor or powered USB hub, all you need is 250mA of juice from your universal serial bus, and a little patience. In just a few hours, you'll have 1300mAH of power!"
A pair of USBCell batteries sells for $19.95.
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