Revealed by Google of a super secret project they have been working on for a few months, completely overhauling the underlying infrastructure that would change the way Google crawl, index and rank web pages.
Matt Cutts claims the search results will still be very close to what they have been in the past. But believing it to be a big enough change, Google opened a sandbox for users to try the new architecture. I did, couldn’t spot the difference. Then again, I was never good at spotting differences.
Give it a spin and if you get bored, surf on over to the hour and a half video of Wave, that would knock your socks off.