We are building omnom.com and use Maxmind GeoIP to populate our city dropdown with nearby cities (click on city tab of homepage > view dropdown)
It's pretty inaccurate. Our options are: Upgrade to paid to improve accuracy, use different IP location, or find some other type of user experience for people that want to browse/not put in their address. I would love any feedback/help. Thanks
Upgrading to MaxMind's paid database is really the best option, assuming you can afford it. If you can't afford it and you can't cope with the inaccuracies of the current solution, you might be able to go with a hybrid-solution that'd incorporate Google Maps (http://code.google.com/apis/maps/documentation/javascript/ba...)
This is the service I use: http://www.maxmind.com/app/web_services_omni and if you ask they will probably give you a trial account.
I use it here: http://localbeer.me
Try HTML5 geolocation. The user has to give permission (through the browser), and its not universally supported, but, the results tend to be pretty solid. http://html5doctor.com/finding-your-position-with-geolocatio...