Requirements

The "Teenagers Do No Need OpenID" thread on general.openid.net hints at requirements that a user that has a contact list – a list of OpenIDs of other users – not be able to publish that list without the consent of the referenced users: http://openid.net/pipermail/general/2007-January/001427.html. The requirement is probably that the owner of the OpenID must approve the connection to the referencing user, and that the owner of the OpenID must approve of how the OpenID is published.

Lukas Rosenstock posted a draft specification to the OpenId list for allowing users to add RSS feeds and other things to an arbitrary data collector. Here is a copy of 0.1d of the specification

Phil Ashlock has a page of notes regarding user-centric identity.

Six cool things you can do with OpenID.

Export and import attention data with AMPL: http://www.apml.org/index.htm