I have been working with Mary Hodder, Drummond Reed and Andy Dale on itags. It is an open adhoc standard we are proposing for alowing people to use their identity while they tag. This could be a URL they ‘own’ (OpenID) an i-name (XRI) they have or another UUID.
Creators of content could use this to assert CC licenses and provide a long term persistent way to have attribution. People can assert tags across silos – multiple blogs that one posts on and multiple media tagging sites that one tags on.