mapping tool for only $200 for the whole country

http://risearch.org/eng/ricoord/index.html


GEOZIP. Unix, $74. Used for dating sites.

http://www.scriptspub.com/scripts/090408000001.htm

Other programs, and he does websites from the guy who does GEOZIP.
http://keskydee.com/scripts.php

Free perl program to do the calculation.

http://www.indo.com/distance/dist.pl