What was the last GREAT professional development you attended and why?

I go to countless amounts of professional development every year, and to be honest, most of them are TERRIBLE. I have found that many times they are a little self-indulgent. Meaning the presenter is not really there to help you out in the classroom, but more so to show off their accomplishments. However, they haven't all been bad. I once had a great PD at Apple on iMovie.
The reason it was so great, in my opinion was because of the amount of hands on training we received on the software program itself. Also, because the entire PD was presented in the same way an actual lesson would be presented. So instead of some self-indulgent person up there with a power point the PD was presented as a lesson as if we were the students. Which in this case we so happened to be. The great thing about this approach though is that it allows you to see first hand the benefits of actually using it in a classroom setting with students. I can't tell you how many PD's I have been in where there was some sort of a product or tool pitched without any clue as to how it would be implemented into each teachers classroom.
To me a good PD is one that is relevant. What makes it relevant? It is relevant to me as a teacher when it is laid out in such a way that I can tell right away that it will somehow benefit my students. OR, it has to make my job easier so I have more time to focus on my students and deal with some issues I might not get to without it. This Apple PD on iMovie did both of those things. It was presented in a way in which I FELT COMFORTABLE TO IMPLEMENT IT IN MY CLASS RIGHT AWAY! That is why it was the best professional development I have been to in a long time.

Some resources on the subject:
http://serc.carleton.edu/teacherprep/inservice/ProgramTips.html

http://allwhowonder.wordpress.com/2009/01/16/what-makes-good-staff-development/

http://www.publicschoolinsights.org/category/blog-story-tags/professional-development