Where to get a free country-region-city data base?

Question

Or where to see such an ajax-driven country-region-city drop down list? The data base could be taken from that site.

Answer 1

MaxMind's GeoLite City is a good place to start.

http://www.maxmind.com/app/geolitecity

You can download a CSV file of regions or a binary file which is accessible through various APIs.

Answer 2

Start here: http://www.geobytes.com/FreeServices.htm