Found a list of micro formats on the microformats.org wiki:
; rel="nofollow" attribute: We know NoFollow, and I’m already using it on Oddmuse to allow robots to follow most links on Recent Changes. Robots should not follow links to alternative representations of Recent Changes.
; rel="tag" attribute: I’m using this in the Oddmuse:Tagging Extension.
; rel="license" attribute: Add an attribute to links that are pointing to licenses of a page. Looks interesting!
; hReview class: Add the hReview class to some elements to indicate to parsers that this is a review.
#Microformats #Wikis