Google may have a battle on their hands in the form of Vivisimo. I am very impressed with the categorization of the search results. Their results feel a little less complete than Google’s, but it still looks like a work in progress.
Unfortunately, though, a Vivisimo ego surf only ranks me 5th, where as a Google ego surf ranks me 1st, 2nd, and 4th. If you’re listening, Vivisimo, if you want me as a customer, you’d best get on the ball and raise my ranking.