The Open Graph Protocol
http://opengraphprotocol.org
"The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to enable any web page to have the same functionality as a Facebook Page."
Simon Davison - Hi all, rel="me" support has just rolled out on Delicious.com. Enjoy.
http://www.google.com/buzz/l.m.orchard/gtgWLMcuGzK/Hmm-would-like-to-shoehorn-my-delicious-bookmarks#z12oilcj0tjmsvjzi04cidozlzmzdrf4t54#1267578622581000
Ident Engine
http://identengine.com
"Without much conscious thought, most of us have built identities across the web. We've filled in profiles, uploaded photos, videos, reviews and bookmarks. The Ident Engine uses semantic web API’s to bring together these web footprints."
Layoffs and Social Media (by Jeremy Zawodny)
http://jeremy.zawodny.com/blog/archives/009965.html
"Boy, it's been quite a week so far."
Identity Hub (WebSeitz/wikilog)
http://webseitz.fluxent.com/wiki/IdentityHub
"Digital Identity? Source for Universal Inbox? One piece of Open Social Networking Model?"