Big negatives with yellow pages. With the right wording you can use your website, google, yahoo, etc and get it up there better and cheaper.
I ran the marketing for a few car dealerships and now sales/marketing director for an employee benefits company.
A good way to tell this is use google for instance and search a company. The yp results are never near the top. I had trackers like crazy and unique links from every site including yp while paying them good money and we had like 6 hits on year from them vs thousands other places. Went to cut them off when the rep came in and he told me I didn't know what I was doing after me turning him down several times. Started talking loudly about me in a showroom full of customers. I dislike them more then anyone else.
What's your website / company name? Maybe I can give you some pointers.
Also when I was learning I worked with a girl who did analytics and she felt the same way.