I don't think I've done a collective one yet, although there was a bunch of authentication work done during the year.
It got mentioned in the newsgroup webinars a few times, Oh, and I covered it at the training at Devcon. I guess I need to do it as a Friday webinar as well. I'll ask John when it can be scheduled in. (There's no webinar this Friday as far as I know.)
Cheers
Bruce