I already have an account with a site, there should be a standard way to attach my openID to login
this may be entirely up to individual sites,
but perhaps there is an approach that could be suggested,
for example, in case my idea is not clear:
I have a livejournal and a blogger account.
I have just discovered openID and want to use it.
I want one ID so decide to use my bloggerID
If I sign in to Livejournal with that I get a new account,
sites should be encouraged to attach openIDs to existing accounts,
or even multiple open IDs to an account.
I have 5 openIDs, how do I remember which one I used on different sites...
If I want, they should all go to the same account
AdminChris Messina (Admin, OpenID) commented
I think the issue is that we haven't well specified how RPs should allow people to associate many ids and OpenIDs to their accounts. This is called "account linking" or "identity consolidation". Facebook actually does this fairly well (even though they haven't exposed it on facebook.com):
But you're right — this is something that's left to each provider. We can only really provide guidance.