It's the most basic of tests for IT people: can they make the machine they are working on produce the words "Hello World!" on the monitor or a printer?
And so, as today is the first day of the rest of the life of this website, which was the first website we built even before we owned the domain name, it's fitting that the first words on this blog should be that test. But it's not the first time we've said "Hello World!" So we're saying it again.