@nickspiers: I'm pretty sure MEF supports all the features you're asking about. One of the other comments from above, by Nicholas Blumhardt, was made by one of the folks responsible for MEF 2. He would definitely have some good examples out there on using it. mef.codeplex.com has some awesome resources on using the new implementation, too. It has a fluent or attribute-based wire-up methodology.
@nickspiers: Having one of those "not worthy" moments, man! Thanks for the amazingly supportive comments. I'm honestly thinking of making a series out of these. You guys thing that'd be a good thing? A "how to with MEF" screen cast series?
I appreciate the feedback and will adapt for future interviews. I was pretty excited about this interview, so forgive my enthusiasm for all the topics these guys covered. It was a really great chat, and I hope that didn't detract from the quality of information they put forward.