I have a list of about 500 cities that I would like to be able to obtain driving distance/time between them for a research project. It would seem I could use the API of yahoo/google or Maptech to do this but I'm not really sure how. I generally do VB.net programming (non web based) so I was planning on writing an app to loop through the cities, I just don't know how to pass the information to one of the API's and get the results back. I would rather use actual driving distance rather than just line distance as that is more relevant. Can Anybody give me some direction or possibly an example.