Google Earth cannot be installed with package-manager because its license doesn't allow anyone to distribute it freely. But you can still install it by following these instructions:

The easy way

Add the following source to your Package Manager

Name: pardususer.de
Address: http://pakete.pardususer.de/pardus-2009/pisi-index.xml.bz2

in console with: sudo pisi ar pardususer.de http://pakete.pardususer.de/pardus-2009/pisi-index.xml.bz2 -y

Installation

GoogleEarth can now be installed in Package Manager (after doing a "Show Upgradable Packages").

From Google Earth website

1. Download Google Earth from http://earth.google.com/download-earth.html
2. Right click downloaded file and select Properties
3. Select Executable check box in Permissions tab
4. Click OK button then double click (or right-click > Open) the file to run Google Earth installer
5. This will install Google Earth in your home folder and put an icon in KDE menu
6. To repair a bug in Google Earth go to the directory /home/your_username/google-earth and remove the file libcrypto.so.0.9.8