Now I know you guys aren't going to act like you don't know that a /who, /whois, and even /whowas command can lead someone to your front door! You get the IP, you go to the whois website, or Network Solutions / Verisign - in nothing flat you have the users address, phone, real name, server, and other pertinent information.
I hope you tried doing that on yourself. If so, you'd see that unless you're running your own ISP, that information isn't even remotely close to being about you. I just did a search for my IP at Network Solutions and it said that I was in Milton, Queensland somewhere, which is two days drive from where I live. The most accurate information returned about my IP is that I'm in Australia, which I'm more than happy to admit.
I'm not an expert on these matters and I'm sure there is a way that information can be used with harmful intentions, however, I would say that it'd take more than just entering an IP address on a website.
