Thanks for that link. I just spent 20 minutes playing 'alien' and trying to figure out who, where and what we are from these images:

http://voyager.jpl.nasa.gov/spacecraft/sceneearth.html

I love the premise.

"Please note that these images are copyright protected. Reproduction without permission of the copyright holder is prohibited."

So the Aliens first have to come to earth to ask permission to make copies for analysis :) ? Smart NASA, smart!