The most visually interesting is the 3D buildings available in 39 cities. The most interesting new trick is the integration of Google's Local Search and Driving Directions services directly into the application. You can search for local businesses or type in addresses and then generate a driving route between them. There are lots of other tweaks and changes. In particular, the program is faster now because it has been modified to make efficient use of Google's servers to provide the images. You can now add lines and polygons to your map markup, in addition to the point placemarkers it's always had.
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Windypundit
Check the Google Earth UI
here.