Thanks to Glenn (and Jad, Wes, Kevin) hard work, there is a first drop of MEF codebase available at CodePlex. I’d be really interested in your comments.
Read the overview, the guides and the samples. Get your feet wet. Then go wild. Stretch it, bend it, try to break it, and please let us know what you like or dislike about it. Your feedback at this time in development is gold.
You can reach me at hamilton.oliveira at microsoft dot com
Update: wrong email. The right one is hamilton.verissimo at microsoft dot com