When you publish an entry all the people on your mailiing list get an email alerting them to the fact. However wouldn't it be nice if a much wider audience, potentially thousands or even millions were to get to know about your post?

A detailed explanation of IP addresses, the way they are constructed, assigned and put to use; how Domain Name Servers (DNS) are used to overcome the problem of remembering arcane IP numbers; a quick look at the "ping" and "tracert" programs.