Hi,
during the last weeks, I had very much joy in google co-op. You will find the first example of this tool now online for public testing. Based on Wikipedia's geographical information, you can calculate the distance between two cities.
The google profile for this can be found at http://www.google.com/coop/profile?user=016597473608235241540
A short description is at http://meta.wikimedia.org/wiki/Google_Co-op#Distance_calculation
When subscribing to this google co-op-profile, a search like http://www.google.com/search?hl=en&q=distance+from+tampa%2C+florida+to+b... should work.
I appreciate any feedback about this (feel free to forward it to your friends, if you like). Please use the meta page for suggestions to improve it. Please continue to tag the articles with metadata such as geoinformation. Thanks again to anyone who has already helped in this project. There is more to come.
Mathias