If you think it's time to really start gettng to grips with Microformats, then a few new things have just gone online.
Roger Costello has a series of pretty in depth tutorials for most major microformats, while at Web Directions North (disclosure, I was one of the organizers and presenters) there were three 1 hour presentations spanning a broad range of microformatty goodness. Tantek Çelik presented the big picture, while I looked in detail at microformats from a developers perspective, and Dan Cederholm followed up looking at microformats from a designers point of view. Slides for Dan's and my presentations are online now, with a number of other presenters slides. Podcasts and slides for all sessions will be available soon