Northrop Grumman Lunar Lander Challenge in Google Earth - In keeping with the Google Earth theme, the Launch Pad is making a KMZ Google Earth file for the Lunar Lander Challenge. I assume it's similar to the one they did for the Google Lunar X PRIZE. I'm not sure because I get a link to an Unreasonable Rocket image, not a KMZ file.
Anyway, here's another Google Earth competition I found. The 2008 version is over, but maybe there will be one in 2009. It's a competition for the best SketchUp Google Earth campus model: 2008 International Model Your Campus Competition! It's fun to find a campus you've been to and fly around. Not satisfied with the satellite or aerial images, one team took their own balloon-based images.