Chris, I just rejoined Angie's List, which has grown throughout the country. Have you heard of it? It's all about members using suppliers, contractors, plumbers, etc and reporting back to the group.
Sort of like feedback for eBAY except you get to grade the people you hire A-F and leave extensive details.
Anyway, that's what I thought of when you mentioned this idea. epinions is another example, but I doubt the Club has the resources to put something like this together anytime soon. Something about "hours in a day."

Just my .02