Google openid already supports persistent id independent of user name
or email address.

http://code.google.com/apis/accounts/docs/OpenID.html

On Nov 7, 5:56 pm, Alexander Kojevnikov <[EMAIL PROTECTED]>
wrote:
> Ryan,
>
> I see now. It looks like Google is going to fix this in the future,
> see the last paragraph on this 
> page:http://code.google.com/appengine/docs/users/userobjects.html
>
> I couldn't find an issue for this, adding one would speed this up...
>
> Alex
>
> On Nov 8, 6:09 am, Ryan Lamansky <[EMAIL PROTECTED]> wrote:
>
> > Alexander Kojevnikov: Although your plan would function, it offers no
> > protection from email address changes.  If the user changes their
> > email address, they would no longer match their original UserProfile
> > (because UserProperty is just a fancy name for "string", as it stores
> > only the email address), thus cutting them off from all referenced
> > data.
>
> > -Ryan
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