You have probably heard of Google Earth/Sky and maybe Microsoft Virtual Earth.  Well, our friends at Microsoft have released a beta version of a new software piece called WorldWide Telescope.   It uses images from sources such as the Hubble to fly you around the cosmos.   Looks impresssive.  Possibly useful for an earth and space science class.   Here are the links for all the sites listed above.

http://earth.google.com

http://www.microsoft.com/virtualearth/

http://worldwidetelescope.org