You can learn a lot about microformats by studying how they are actually being used on the Web. Some implementations include the following:

I suggest using the list of implementations of microformats in the wild (http://?mic roformats.org/?wiki/examples-in-the-wild), which includes lists for geo, hCalendar, hCard, hReview, and include-pattern. Go to the listed sites, and use Operator to pick out the microformats.