The Percon Corp “Spectrum Online” web site has a great front end to the Google mapping that lets you map the location of hams, based on the address listed in the FCC license database. Plug in a zip code and get a map of all the radio amateurs in that area.
There is also a link for searching for frequency assignments from other radio services in a particular zip code.
Very nicely done, so check it out.
Ham radio search:
http://www.perconcorp.com/google_ham.html
Frequency (scanner) search:
http://www.perconcorp.com/google_spectrum.html
73, Bob K0NR