PHP IP sniffer script
This IP address sniffer script will sniff out your visitors IP address and email it to you without notifying your visitor. I would not place this on a high traffic page but it might be useful on protected pages etc. You could easily modify this IP sniffer script to do more.
To download this IP address sniffer script click here: IP sniffer script
You may modify this IP sniffer script as you see fit.