One of the best is that added support for exporting waypoint Collections to KML, GPX and GeoRSS which you can load directly to just about any portable Navigation system. I love this as I love traveling and have no sense of direction. But I think what matters most is that more capability for mashups.
Following are the new features;
Export your Collection to Your Navigation/GPS device.
Improved 3D cities.
3D modeling with 3DVIA
Labels for Birds Eye imagery
1-Click Directions (Party Maps!)
Enhanced Explore of Map Content from across the web contributed by other People
Neighborhood Subscribe via GeoRSS
Tour Enhancements including Hi-Def Movies.
Directions and Traffic Enhancements
The New Release of Live Maps and Virtual Earth 3D is now Live!
tag: Live Maps, GeoRSS, MapCruncher, 3DVIA, Birds Eye imagery, Navigation, GPS, mashup