sacred cup or grail-shaped beacon?

I am greatly intrigued by the submission of Calendaring Extensions to WebDAV (CalDAV) to the handy Internet Drafts feed maintained by InterGlacial (thanks!).

Integrated calendaring is the elusive killer business app that causes blithely functioning *nix-based email systems to be bulldozed up and replaced with Exchange, since "we need calendar anyway". It's basically Exchange, Meeting Maker, or Steltor out there. iPlanet's calendar may now be mature enough to be considered a 4th option. They used to license Steltor, but after Dec 31 1999, they transitioned to their own internally developed calendar-- which wasn't quite ready for prime-time yet but presumably has matured.

But my gracious, how times have changed. Internet drafts now start with things like this: By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79.

Seems like a nice extension of WebDAV, for all that I'm a mere tourist in the web-protocol world. Will have to go poke for reference implementations.