Besides consuming Microformats - it’s useful to know how to produce them. Assaf Arkin has extracted a Microformat Helper from his scrAPI plugin. It supports hAtom, basic hCard, and the datetime design pattern currently - and should be easy to add some more microformats. Check out his Microformat Helper Cheatsheet if you’re addicted to that sort of thing.

Out of the Ruby realm, BlogHelper has a good set of tools and howtos for Using Microformats in WordPress.

As most people who read this blog are probably aware, Flickr added mapping directly. What they didn’t advertise or get talked about is the formatting they’re supporting.

Hidden underneath the “taken…” line is a bit of Microformat geo:

<span class=”geo” style=”display:none”>
  <span class=”latitude”>38.017804</span>,
  <span class=”longitude”>-78.475342</span>
</span>

Additionally, in the RSS output, you can get GeoRSS tags. You need to add the following to your URL: &georss=1.

It’s a great example, and source, of how easy it is to add some simple markup to your HTML and RSS to add geographic annotation.