Don't Sip A Draft: Draft A SIP!!
Instead of sipping drafts, how about drafting a SIP? Well, if you are interested in the security aspects of SIP (Session Initiation Protocol), some folks at the Internet Engineering Task Force have worked up a draft for a scalable solution that, according to the authors, "defines a Credential Service that uses a SIP subscribe/notify mechanism to discover author users' certificates and credentials and be notified about changes to these certificates.