Text of Wired's Interview with Google CEO Eric Schmidt -

Well, essentially, we do all of the software. So the computers that we're running start off with Linux as the base, but after that it's really custom software to move all the data around. The Web services, all the identity management, all of the database activities, all of the indexing, all the searching, all the ranking, all that kind of stuff in the cloud we do ourselves. This is a great core competency of the company.

Highlighted by joel