Microformats: What, Why, and How – Nettuts+

There’s a lot of data on the web. Like, a lot. But I would guess that the data most useful to the masses—such as information about people they need to contact or events they need to attend—is stored in HTML, where you can’t easily get at it. So, who you gonna call? Microformats is attempting to take on the job!
(Link: Microformats: What, Why, and How – Nettuts+)