I recently did a search on Windows Live Maps and noticed they had filters. I thought this was very interesting. The engine comes up with filters related to what you're searching for and tries to limit the less likely results. For instance, if you do a search for best buy, you get all kinds of stuff (i.e. Best Buy Flooring and Best Buy Transport Incorporated). However, you can add filters to limit it to what you are really looking for. In this case, I can add Computer & Computer Equipment Dealers or Electronic Equipment & Service as a filter to get more specific results. Perhaps this is a bad example, but you should get the idea. Nice addition to the service.