DevShed has the next in their "IP to country" series posted today, this new tutorial showing how to create a more customized site (a simple page or two) with the IP detection and a front controller.
Welcome to the third part of a series on developing an IP-to-country mapping application with PHP. Made up of four approachable tutorials, this series teaches you how to create a program like this by using a single MySQL lookup table, and shows you how to use this program to enrich your own web sites with geo-location capabilities.
They use the mapping data you pulled from the Webnet77 ip-to-country database (and dropped into the MySQL database) to evaluate where the user is coming from and display product information based on the two letter country code it returns. They throw in a bit about a front controller too, a simpler way to ensure that the user's location code is set for every request.