Simon,
Simon Josefsson wrote on 08/12/2003, 4:26:
Julien, Alberto,
There is a DNS RR for X.509 certificates (and CRLs), see RFC 2538.
Unfortunately it doesn't include useful RR owner name guidelines to
make it work in practice.  I have made some clarifications for this in
http://josefsson.org/draft-josefsson-pkix-dns.txt
which also includes recommended owner names for S/MIME certificates.
Thanks. This is very useful and I will look into it.
-- 
I am the dog in dogfood
 smime.p7s
smime.p7s
Description: S/MIME Cryptographic Signature