Sites featuring Refinement
Yellow Pages Canada provides a large number of refinement options although it's unclear what the relationship of them to the core search happen to be.
Following the FURNITURE tag from the results page illustrates some of the weakness in single word tag usage. Public Storage is a storage facility. It may be useful for 'furniture storage' but that's not what's implied by a search or refinement for 'furniture'.
Refinement is available in the Find Nearby view of Yahoo Maps. Refinement by category and rating is available.
Live Local Search Results include refinements based on category and neighborhood. Within each listing are prompts to review and their new "1-Click Directions" capability.
You can get an entire list of the keywords they support to describe the sense of place.
A search for Concerts in Bern shows a very sophisticated way of refining event results based on specific date or by more colloquial expressions, such as 'next week-end'.
Listings and Map view are balanced on the Results page for Local.ch. There isn't a separate view for either.
Refinement in Local.ch is limited to different cities or different categories. The categories seem to be only tangentially related to the core user search.
AutoTrader.ca returns used car search results that are weighted towards dealer results first and foremost.
Google Maps provides results on the map directly with listings on the side. No attempt is made to assist a user in refinement of these results outside of a category-level refinement.