Given the low percentage of "normal user" PGP keys which are anything
but self-signed, would people actually use/give-appropriate-trust to
a service which signed PGP keys belonging to people based solely on
email challenge authentication (like majordomo uses)?

It would demonstrate the user has the ability to successfully decrypt
email to their key, as well as receive mail at the address in their
key id, which is more than can be said of many new users/keys.  I personally
would trust mail-from authentication to provide me a valid email 
address for *someone*, if not the particular person I want to contact, which
is useful in some cases.
-- 
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Chief Technical Officer         
HavenCo, Ltd. ||| Secure Offshore Colocation ||| http://www.havenco.com/
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