Project status, Aug 2007
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Flash applet is based on this example by Andre Michelle and DIY World Map (more flash maps pointers here).
IP2CC is free IP to Country Code database. Along with providing web developers with practical means to use these data, IP2CC project aims to develop tools to maintain data updates.
First get IP2CC database, then download latest PHP sources, unzip and read included documentation. Finally, walk yourself through code samples.