Not just Dave Winer, of course, but a growing number of writers. The advantage of using a URL is that they're freely and widely available, they can be unique, and they can be relatively permanent. The URL, in turn, points to other services used by the person, including identity services, and may provide information about the person, either directly, as a microformat, or indirectly, as in a FOAF. Where I differ with the proposal sketched here is that the URL in question needs to be the identity server in question, because otherwise there's no reason to believe the author of the web page is the owner of the identity.
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