XFN - representing human relationships in links
Very interesting this XFN stuff - the non-symetrical relationships are particularly interesting. XFN appears to be an instance of the small world semantic web - tiny, personal ontologies as opposed to the grandiose, joined-up vision of everything espoused by some. I might bung some if this up on my blog roll. Other wee bits of the semantic web (small "S", small "W") on here include the Atom feed for subscribing to my bosts, as well as the GeoURL details which allow me to see other bloggers nearby.