I use another forum - and on it you can give someone's post a positive or negative response if you particularly agree or disagree with what that person have to say.
It builds up good posters reputation, while marking posters who are wind up merchants or who give people bad advice as just that.
They us a vbulletin forum. They only implement it on the specific forum that deals with trading - buying/selling/swaps, for obviousl reasons its good to know if someone is trustworthy!
Would this be something worth while for Sheffield Forum?