http://www.indo.com/distance

http://en.wikipedia.org/wiki/Distance

http://www.indo.com/cgi-bin/dist

http://www.uwex.edu/disted/home.html

http://distance.uh.edu/

http://distance.unm.edu/index.cfm?fuseaction=centerinfo&center_del_code=SF

http://distancelearn.about.com/

http://distance.ncsu.edu/courses/index.html

http://www.geobytes.com/CityDistanceTool.htm

http://www.usdla.org/

http://www.distance-educator.com/

http://www.distance.usf.edu/index.htm