Solar Powered Backpack!
I came across this link in a blog that I read every morning, that posts various articles on Macintosh related news, and software ( http://www.macnn.com/ )
This backpack looks interesting and may help power your gadgets, and save you some money on your electric bill. Have a look at the backpack here: http://www.voltaicsystems.com/bag_backpack.shtml
It is a bit expensive ($239), but possibly you could recoup that cost in the way of savings on not using your electric power in your home. I have not run any numbers yet, and it may only be a little bit of a savings on your bill, but I think we are headed in the right direction when it comes to alternative energy sources. Al Gore was right.