PGP client programs encourage the use of strong passphrases. The OpenPGP standard accomodates weak passphrases or no passprases at all. DomainKeys' solution requires control over a domain, not a strong passphrase to protect the key representing a domain, so Grandma doesn't need to worry about anything new.
According to the DomainKeys draft, "technical minutiae is not completely covered" (1.6), and "other candidate algorithms could include GnuPG [GPG] variants" (3.2.2) so it doesn't look like an OpenPGP structure has been ruled out.
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PGP client programs encourage the use of strong passphrases. The OpenPGP standard accomodates weak passphrases or no passprases at all. DomainKeys' solution requires control over a domain, not a strong passphrase to protect the key representing a domain, so Grandma doesn't need to worry about anything new. According to the DomainKeys draft, "technical minutiae is not completely covered" (1.6), and "other candidate algorithms could include GnuPG [GPG] variants" (3.2.2) so it doesn't look like an OpenPGP structure has been ruled out.