As Mark pointed out, all PDC slide decks are now online.
Especiall interesting for all MCMS customers would be the following slide deck from Microsoft Lead Program Manager for Content Management Server Ryan Stocker:
OFF313 Web Content Management Application Development and Engine Extensibility
OFF313_Stocker.ppt
And here is a link to another related sessions:
OFF308 Windows SharePoint Services ‘v3’: Creating and Defining Custom Templates, Sites, Features, and Solutions
OFF308_Ammerlaan.ppt