Here's a great idea: A solar panel that you can take anywhere to be easily placed on a backyard with no installation. Too bad it makes your house look like a gas station when opened:

The Solar Tree was invented by Gurdeep Sandhu, and avoids the complicated process of having to install the a solar power system on your roof. You can move it too, so if you change house, you can take it with you. It doesn't entirely solve the aesthetic problem of having such a thingamajig on your garden, but at least is better than having a roof full of panels and it can be folded at night. [Ecofriend]

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