The worldwide market valuation of the Yellow Pages industry is more than $100 billion, according to a Kelsey Group study cited by iMedia. Reliable cash flows and increased advertiser interest in new and directional media are among the influences driving the growth. The report shares metrics on companies and markets profiled, including online and wireless products, revenues and growth rates.

The Kelsey Group estimates that 70 percent of U.S. households today use the internet as an information source when shopping locally for products and services.

"The Yellow Pages claims they were the originator of local search. The steps that Google, Yahoo and other online players are taking into local search might have in some way inspired traditional Yellow Pages publishers to become more innovate and adaptive." says Neal Polacheck, senior VP, The Kelsey Group.