I like the idea, but it is not ready for primetime.
There's no explanation of the syntax and no "advanced search".
site:www.habitablezone.com alcaray found no hits and I have no idea why. It may be that "site:" is not implemented at all. Or that I have the syntax wrong. Or that it doesn't like "www" or it needs "http:".
Also it is very slow. If they want to do what they want to do, they will have to solve their server/bandwidth/search effeciency/display effeciency issues.
When they get it sorted out I will drop google in their favor instantly.