There were a bunch of Bing announcements today, but the highlight is without a doubt the beta Silverlight-enabled Bing Maps. Using any other mapping service is a bit painful now. Think the leap from MapQuest to Google Maps. Silverlight is (obviously) required to take advantage of some seriously sick performance.
By default, the map mode will switch as you zoom really far out or really far in. It’s very effective and now, Bing Maps even has a Google Street View mode. There’s some fun Microsoft Research backing to the StreetSide views, as Microsoft is choosing to call it. It’s only available for limited locales for now.