hacktolive.org

Google Earth 5.0.11337.1968 Portable is available here:
http://hacktolive.org/wiki/Portable_Applications_(Windows)

Notes:
-On some computers the graphics are not displayed properly. To fix that just change the mode from DirectX to OpenGL (Tools->Options->3D view->Graphics Mode)
-When you start “Google Earth Portable” you get an error about GoogleUpdate.exe crashing, just ignore it, and then Google Earth will be launched

Tested on Windows XP/Vista