This DIY controller for Google Earth goes straight to the front of the line for sheer inventiveness and bloodyminded perseverance. It’s not exactly portable, but who needs portability when you’re having this much fun?
More photos at the other side of the above link.
This looks like a very clever DIY implementation of Globe 4D.
Here’s an even more impressive way to hold the earth in your hands.
Got to http://www.earthhour.org/earthinyourhands
Very cool technology