###LiveJournal openid
One caveat to the above is that, of course, OpenID is a distributed trust system which means you do have to think about the trust aspect. A case in point is livejournal.com whose OpenID implementation is badly broken in one important respect: If a LiveJournal user deletes his or her journal, and a different user registers a journal with the same name (this is actually quite a common occurrence on LiveJournal), they in effect inherit the previous journal owner's identity. LiveJournal does not even have a mechanism in place for a remote site even to detect that a journal has changed hands. It is an extremely dodgy situation which they seem to have *no* intention of fixing, and the bottom line is that the "identity" represented by a *username*.livejournal.com token should not be trusted as to its long-term uniqueness. Just FYI. --[[blipvert]]
###LiveJournal openid
One caveat to the above is that, of course, OpenID is a distributed trust system which means you do have to think about the trust aspect. A case in point is livejournal.com whose OpenID implementation is badly broken in one important respect: If a LiveJournal user deletes his or her journal, and a different user registers a journal with the same name (this is actually quite a common occurrence on LiveJournal), they in effect inherit the previous journal owner's identity. LiveJournal does not even have a mechanism in place for a remote site even to detect that a journal has changed hands. It is an extremely dodgy situation which they seem to have *no* intention of fixing, and the bottom line is that the "identity" represented by a *username*.livejournal.com token should not be trusted as to its long-term uniqueness. Just FYI. --[[blipvert]]