my girlfriend used this website to find some reputuable contractors to work on her house extension. Out of 4 people that she got on there (architect, plumber, sheet rocker and general contractor...the only one she really wouldnt receommend is the architect.
They supossedly screen the contractors, I guess its a little better than just opening up the phone book and pulling a name that way.
I put in an inquiry for our cement slab that we need in the backyard...we should get some feedback shortly!