Would be great for corporate intranets (Score 1)

Though their public internet search would struggle due to all the other comments noted, for their corporate customers this would be a great addition. Inside a coprorate intranet, there is deep need to know which documents found are the best to refer to. (For those that didn't know, Google sells their technology to run inside corporate networks for their own internal websites and documents). This addition would reduce the need for adding other Web2.0 tools into a corporation, such as social bookmarking, etc. by helping business' internal users tag the value of the data directly within the search tool.