Check it! You can now explore the oceans in Google.Earth. It looks pretty awesome and immersive. Not too much right now, but I expect it to take off really fast.
It looks like the ocean images aren't taken by satellite, rather, it's 3D modeled from existing data. That limits it quite a bit, no way to make new discoveries, only look at old ones (in a new way).
Pretty cool though, they'll just keep expanding this technology. Can't wait to see what they'll do next.
There's a video about it on the linked page. I've yet to download it and play with it myself. Maybe combine it with the flight simulator.