I just stumbled across this very cool beta from Microsoft Research and a bunch of space agencies, named Microsoft WorldWide Telescope. It’s like Google Earth but for outer space.  It has images from “including the Hubble Space Telescope, the Chandra X-Ray Observatory Center, the Spitzer Space Telescope or others” all in a cool DirectX 3D view.  It features 3D views of all the planets and the dwarf planet (or whatever the heck Pluto is right now) along with major Jovian moons.  Screen shots of Jupiter and Neptune:

It also has panoramic views of alien vistas as captured by various landers, rovers, and other robotic exploration vehicles.  Check out the picture below:

You can also click on particular celestial body and pull up details of object such as research information via Wikipedia and SIMBAD, declination, altitude and azimuth (so you can find it using your analog telescope). You can also find the Rise, Transit and Set time for the object.

You can also search for any celestial object and get the WorldWide Telescope to pan and zoom straight to the object.  The search function can also plot the results in the night sky.  WWT provides multiple imagery sources for the the night besides visible light, including Infrared, various Microwave bands, X-ray and Gamma radiation.

WWT also allows connection to a digital telescope control so you can very easily identify what you are looking at in the night sky. There is also a Community function that allows you to connect with other people to share the fun of WWT.

In additional to all of the above these is a very cool Guided Tours function. This function contains various custom made tours of the night sky from the ‘Center of the Milky Way’ to view of Dark Matter to cosmic dust clouds that show starts forming to the X-Ray Sky to Mar landing attempts over the years to view of the Earth’s lights at Night.

Enjoy! :)