You're might be aware of this, but Maxmind has a free database for geolocating IPs down to the city level. It's also open source. http://www.maxmind.com/app/geo

You're might be aware of this, but Maxmind has a free database for geolocating IPs down to the city level. It's also open source. http://www.maxmind.com/app/geolitecity http://www.maxmind.com/app/geolitecity