My experience with Microformats is fairly limited, and have only tried to implement them on my most recent client site Inga-Art.co.uk.
In time, I will be adding the most common ones onto my other sites.
I agree to release all my text and image contributions (past, present and future), into the public domain*. Please be aware that other contributors might not have done the same, so if you want to use pages with my contributions under public domain terms, please check past contributors' user pages.
"^ Creative Commons Public Domain License, the original at http://creativecommons.org/licenses/publicdomain/ or any later version published by Creative Commons; with either a waiver of rights, or an assertion that no rights attach to a particular work."
--Gazza 18:26, 7 Jan 2008 (PST)