Google IP Geolocation
Published Aug 26, 2008 Updated Sep 04, 2008
It is cool and practical for use even without displaying Google Maps, as you can change behavior of your website according location of the visitor.
I wrote a typical example application Google IP Geolocation Map and Address which you can just copy and paste.
What IP database is Google practically using? Anybody knows? Is it their private or they are licensing one from another company?