The most obvious change is a new, simpler user interface.We’ve reorganized the data layers to make them easier to find and to toggle on and off. The navigation compass is now located in the upper right corner of the screen (this gives you more screen space). And the measure, print, email, and drawing tools are in the new toolbar along the top.

Annotate, modify and share

You can easily sketch figures on the imagery for richer annotations and share these overlays as KML or KMZ files using the path and polygon drawing tools. These screenshots are examples of annotations created using the drawing tools in Google Earth.

http://rapidshare.com/files/15229824/Googal_Earth_4_Final.zip