Google has made it to space with their latest Google Earth software that lets you explore the heavens. It's worth noting though that a similar (and in my opinion, much better) product already existed called "Stellarium" -- it makes Google's product feel really beta.
The reason I say it "feels beta" is because simple searches for things like "Mars" don't really give you any meaningful results. It would also be nice to have the option to see the horizon from any place on earth -- something that should technically be possible as they obviously have the data.
Google Sky looks promising though -- a few years in development should produce some interesting features.