Nice to see discussions about Geo Sorting! It's the best way to keep your revenue up as the times keep getting tougher and tougher!
http://www.trafficjuicer.com/ is free (err.. we pay you to use it!).. We released it in Vegas, people have been giving us some great feedback..
Our next TrafficJuicer version update will go live this week and the features will kick even more ass!
One of the new features will allow you to filter traffic without changing any of your links
-KC
KC AT paycounter.com if you have any questions or need help.