Sometimes I need to know my IP and my hostname and I'm too lazzy to open the command prompt. So I just visit http://snoopmyip.com and this website shows my hostname and my IP. I also work in the hosting business and it's the easiest way to lookup a client's IP and hostname. Instead of explaining all the steps for him to check his IP through the command prompt I just tell them to visit snoopmyip.com and it's idiot proof. It's a nice tool and it's free.