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Live Journal produces 15 million foaf files Anil Dash told me at the GNoTE conference yesterday.

That's 15 million rdf files ready to be used by a Semantic Address Book. I am thinking of writing one. Just drag and drop a foaf url (like mine) onto such an address book, and presto all the fields would get filled in including images, geo location information, and friends. The advantage over a simple vcard? An address book could poll a foaf file at regular intervals to keep up to date with changes to your friends foaf files: find out if they have started writing any new blogs, started some new projects, changed house or telephone number, moved, married, ... That should be a killer app. It would also be easy to update one's file: a simple ftp or HTTP PUT to a web server, and your friends and business partners would be able to keep in sync with your contact info.