What about their Open Source version - http://www.maxmind.com/app/geolitecountry http://www.maxmind.com/app/geolitecountry ? I haven't started using it yet,

What about their Open Source version - http://www.maxmind.com/app/geolitecountry http://www.maxmind.com/app/geolitecountry ? I haven't started using it yet, but they claim it offers only slightly less accuracy with access to all of their libraries.