This is way too cool to pass.
Watch this video first.
Using two home-made LED globes (instruction here), you can control Google Earth using the open source software from atlasgloves.org. How it works is explained in the website:
The user stands in front of a large scale projection of the earth with a special set of illuminating gloves on their hands. By gently squeezing each glove, an LED turns on, which is translated by the computer into navigational commands. The user is then free to fly above the world, zooming in and out, tilting, rotating at their leisure.
See another demo here.