One of the big problems when trying to convince people about OpenID is the fact that your identifier is an URL. Which I find totally cool, but other people seem to think that users don’t have enough capacity to understand that they can use some other string instead of just using an e-mail address 
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Brad Fitzpatrick was clever enough to realize it is possible to use an email address as an OpenID identifier, with some XRDS magic 
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And now after some months we have Email Address to URL Translation (EAUT).
You can already use it, even if your e-mail provider haven’t implemented the EAUT protocol via EmailToID .
