I asked Libby Miller if she knows a tool to convert apple address book to foaf. She pointed me to
http://www.holygoat.co.uk/applications/address-book-foaf/projects/ab/ab.py
and this
http://people.no-distance.net/ol/software/ab-foaf/
we’ll see if this helps for the gnowsis integration, hope so.
I wipped up a little tool in obj-c to do that as well, in order to be able to blog AB entries. I you’re interested, I can send you the code.
What I’m looking for now is the opposite – a foaf to AB converter. foaf2vcard would already suffice, but sofar I havn’t found anything that I could integrate in my application (only a JavaScript based thing).