Use your email address as an OpenID

We're not quite there yet, but soon you'll be able to use any reasonable user identifier as an OpenID.  Most importantly, email addresses.  Dirk just wrote a great blog post explaining "Email Addresses as OpenIDs" which goes into the nitty gritty.  Basically, this all just needs a finalized XRD spec to rely on, and adoption of same (and ability to use acct: URIs) in the next rev of the OpenID specification.  The upcoming IIW will be an great opportunity to make some progress on these.