Dan

I have to say I've heard sooooo may people that have paid yellow pages and lost had very little or no business at all from it. I have a free listing usually but will never pay for that type of thing. You can get a much better ROI on other things like a website or smaller local rag type ads - if that's your flavour - though I don't do rags myself but can say I know many that use it as their sole tactic.

My advice would be to consider your options wisely before being sold some ad you don't even know will work.