People, get a life, This same functionality has ALWAYS been built into OS X. This just gave a special program to identify a person's IP without opening the terminal or a Packet Sniffer. It's not they can just grab anyone's IP. You have to have a direct connection. (Which means you go strait to their IP instead of through AIM's server.) There are ALOT of other ways people could get your IP. (Mail, Web Server, just about anything you use to connect to the internet)