Astronaut Mode For Google Earth.
This is just too cool! Someone photoshopped a NASA astronaut photo and created a screen overlay in Google Earth that just makes browsing the Earth a lot of fun! The photo is a little weird to look at because it shows the astronaut’s reflecting helmet mask with his arms seen out front. But, the fun part is imagining yourself as an astronaut flying around in Google Earth. The mode gives the same sensation whether you use it in Google Sky mode, or in Google Earth mode. Download the astronaut overlay here 
(577 KBytes). Choose whether you want Sky or Earth mode (you must be using GE 4.2 or greater). The file was posted at the Google Earth Community. This is truly amazing – check it out!
NOTE: to turn off the astronaut, simply look in the Temporary Places folder in your Places pane for “SpaceSuit” and turn it off.
By the way, the astronaut also works well with the Google Earth flight simulator mode, or even better if you use the SpaceNavigator (the 3D mouse I use every day with Google Earth). A couple tips on creating screen overlays: KML documentation, or a free application on making them by FreeGeographyTools.
By Frank Taylor of Google Earth Blog. [Google Earth Blog]