A month ago I got my oil changed at this car shop because they advertised only $19.99. Yay, a good price so I rushed over and had my oil changed. When I returned to pick up my car they said there were x, y and z wrong with it which would cost me another $600. Basically, my car was not drivable with all the things wrong with it. This was completely untrue and I really had no way to guage whether they were full of crap or not. So here is the idea.
Create a neutral third party business that verifies Car Repair Shops.
Yes, there are clearly TONS of issues with this but the real problem with mechanics is that you always feel like you are getting screwed. What if they could get verified and have a sticker proving they were decent? I provide the random ideas, now you provide the criticism:)