Looks like another wow application from Google--Google Sky ! You can even use it within the Google Earth application! Looks like they have done what they did with Google Earth and created an application that stitches together the body of knowledge about the universe--in pictures. It's all very smooth and swoopy! Cool! I've only just downloaded it and haven't really gotten to play with it, but it looks like a powerful tool to use with students (and me too!) learning about the solar system.
Good info page about Google Sky is here. More here with screencast. Looks cool!