Yahoo available AX attrs

[SitG Admin]

>If the OP allows the user to specify an email address without 
>confirming it, the RP should know that - and then do their own 
>confirmation if that email address is being used, say, for sending a 
>receipt after a purchase, or for recovering an account if a user 
>forgets their OpenID (which happens more than you'd imagine).

Or identity correlation - "Hi there, 'president at whitehouse.gov'. Our 
list subscriptions are indexed by E-mail address, which is a 
reasonably unique identifier in the E-mail namespace, so would you 
like to see the archives of any list you are currently subscribed 
to?".

-Shade