http://scan.sygate.com/
I got
We have determined that your IP address is xx.xx.xx.xx (edited)
This is the public IP address that is visible to the internet.
Note: this may not be your IP address if you are connecting through a router, proxy or firewall.
Trying to gather information from your web browser...
Operating System = Windows XP
Browser = Firefox 1.0
Trying to find out your computer name...
Unable to determine your computer name!
Trying to find out what services you are running...
Unable to detect any running services!