A little over a week ago I wrote a post on how Zip Realty was now taking a semi Web 2.0'ish approach of allowing consumers to rate and provide comments on their real estate listings.  My basic thought was that it simply wasn't going to work, for a couple reasons.  A house unlike other products and services rateable on other sites doesn't stay on the market very long.  Typically someone provides a review of a product/service after they have already bought/used it.  In the context of a listing, if it's been bought it's no longer on the market making comments and rankings essentially worthless.  It also opens a whole pandora's box of manipulation and legal issues.

Galen over at RainCityGuide just wrote a similar post pointing out a few other sites attempting to do the same thing, including ShackYack and Propsmart.  He did a little investigating by looking at listings on these sites and found (suprise) no one was using the feature.  I guess the lesson here is...  A lot of companies are looking to catch a ride on the "Web 2.0" train, but not all the concepts will work for everything and everybody.