Our Natural Language / Language Heuristics Engine can do this. We do to a small extent now, we haven't gone whole hog because I'm not sure I agree that commerci

Our Natural Language / Language Heuristics Engine can do this. We do to a small extent now, we haven't gone whole hog because I'm not sure I agree that commercial sites shouldn't rank. For things we determine to be reference searches we downrank sales pages, for things we determine to be shopping searches we uprank them.