I have just spent some time with the Rep and he believes that yell.com and yellow pages are of some use and that the ROI is good.
What are your experiences?
If your business is local geographic then it's fine, but if you are non-geographic then its just too expensive to even consider.
If you customer base is of the kind who are likely to look up a directory rather than look on google? (My husband's business customers are mostly 50+ and its the web they call from, not the directory)
If there are hundreds of other companies advertising in your category, are you going to have to make disproportionate spending in order to make your advert stand out.
Our experience of many years of yellow pages advertising is
Expect them to make at least one major balls up every year (wrong telephone number, wrong category, wrong address etc).
Expect the cost to increase every year (partic if your directory covers quite a large area - next year they'll probably halve it and make you advertise in two directories.
We listed in yell.com and 118247 and didn't get a call of either all year. What is the point for paying for a priority listing and then getting rotated?
Yell.com listings rarely (if ever) work their way through to organic listings.
In conclusion;
I would work out what you are likely to pay yellow pages, and then think how far that would get you with PPC and SEO. And if you go with Yellow pages, expect pretty good service from your rep this year, and then continually, persistent declining service then on!