Google Earth | Release 4 Beta

Changes include:

• a new, simpler user interface
  
• larger image as a result of navigation tools being moved
• support for "textured" 3D buildings that you can create yourself using Google SketchUp
• smart loading techniques built into KML
• versions of Google Earth in French, Italian, German, and Spanish.
• improvements to our GPS support (in Google Earth Plus only)
• improved terrain, so peaks and valleys are more realistic

It is available for download here