I've participated in several PDC's in the past, mostly as a speaker, but this year I'm helping to do some of the organization.  Recently, I've been in a lot of meetings with Mike Swanson, a Technical Evangelist here at Microsoft.  Mike is one of the key ring leaders in producing the PDC content.  If you were ever interested in how the PDC gets pulled off and some of the thinking that goes into it, check out this video featuring Mike and colleague Jennifer Ritzinger.