Are you trying to get more out of local search? Would a road-map help?
Local search has an entire ecosystem composed of dozens of websites that share and syndicate local search content with each other and the wider Internet.
Check out: A Closer Look at the Local Search Data Providers by David Mihm at Getlisted.org.
They have several graphical depictions of the local search ecosystem, the primary data providers in local search, and the data sources for major local search portals.