the omfoaf ruby app will display the name and photo of the foaf document it is pointed at. below that is a list of foaf friends with homepage button and/or foaf button. it uses the foaf_stone ruby gem i registered this week.
this screencast shows the social network journey from me (donpark.org) -> darrin (typepad) -> elaina (typepad) -> me (livejournal)
 git clone http://donpark.org/src/git/omfoaf