[romland]

So, in the same spirit...

Why nobody uses DNS: http://www.faqs.org/rfcs/np.html#DNS

[viraptor]

Or SIP: http://www.packetizer.com/ipmc/sip/standards.html

[Chronos]

Hmm, roughly half of those concern either DNSSEC or DDNS... which, in fact, no one uses.