Bing’s version of Google Street View, called Streetside has been launched. I had a play on Bing but I couldn’t find anywhere in England that I could use it yet. If you search on Bing Maps for the a US city, like New York for example you will see Bing maps Streetside in action.
http://www.bing.com/maps/explore/
For more fun, click on the arrow on the left hand side of the map (see below) to open the Applications area.
Under Applications you can add real time Twitter updates to the map:
I was going to pick a tweeter at random, but the first two I chose were rude, so I settled on this guy David from Manhattan.
Another application worth trying is the Photosynth, to see real life photos integrated in to the maps in a swishy Silverlight fashion.
For more detail:
http://www.bing.com/community/blogs/maps/archive/2009/12/02/bing-maps-adds-streetside-enhanced-bird-s-eye-photosynth-and-more.aspx