What is WorldWide Telescope? It’s software you can download from Microsoft Research that enables your computer to function as a virtual telescope.

Explore the universe; view deep space images from such observatories as NASA’s Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory; zoom into all-sky surveys, and browse through visible, infrared, and x-ray views of the cosmos.
Follow multimedia guided tours created by scientists, plus you can create your own to share with others.

The WorldWide Telescope is available at www.worldwidetelescope.org

A pretty cool tool.  It reminds me of Google’s Earth & Sky, which offers much of the same features.   http://earth.google.com/sky