Managed Extensibility Framework Modules

I gave a talk Wednesday evening at the Phoenix Silverlight User Group on the Managed Extensibility Framework (MEF). I'm using it just for its plugin capabilities. I have three Modules (Visual Studio Projects) which, thanks to MEF, become Views on a Canvas (Region) as the snapshot below indicates. After 15 minutes of MEF, the conversation turned to Expression Blend 4 and I ended up learning alot more from the audience than they learned from me!