Keith Combs placed a very cool screencast on EDGE which shows a WorldWide Telescope application from Microsoft Research. 

Stars, Constellations, galaxies are all there. Very cool.

You can check this out at the following location. 

The full story and information is on his blog at http://blogs.technet.com/keithcombs/archive/2008/05/13/worldwide-telescope-screencast-now-available.aspx.