Update via Ogle Earth
- US Congress information has been updated to reflect the 110th Congress (Senators and Representatives) who took office on January 4th.
- Updated content from the GeoWeb layer data sources (example, more than double the number of Panoramio photos)
- Updates to other data layers (Volcanoes, ESA images, Tracks4Africa, etc.)
- Updates to GEC [Google Earth Community] content to capture latest posts there.
...and as always, lots of subtle changes to refine both client at data.
- The Overview Map - View> Overview Map (Ctrl +M)
- New Layers and Content - Yelp Reviews, 3D Buildings (from 3D Warehouse), Roads of Brazil, Geographic Web (more Panoramio photos) and Sunrise Earth

Seems the big upadates are available with Google Earth 4 beta this allows to view higher quality 3D Buildings - many of which are photo-textured.
Mapperz recommends that you install
Google Earth 4 beta (build 4.0.2722) because it loads these models faster than the previous releases.
Source and more details:
Google Earth BlogLabels: Buildings, Content, Google Earth, Textures, updated