I am giving a session on the Managed Extensibility Framework (MEF) this Sunday at Seattle Code Camp.  I will be demoing how to build an extensible application using MEF.  It will be fun (I hope), heavily code-focused, and will cover most of the core features of MEF.

MEF was featured in the PDC keynote, and for a quick introduction to MEF, you can watch that part of the keynote here.