To the MEF development team (those that may be left), can I ask that you deliver documentation.
I point you to the following Anders Hejlsberg statement:-
"...I tell programmers half the value you deliver to customers is good documentation for your APIs. A great API is worthless without documentation that explains what it does and how it's supposed to be used."
Masterminds of Programming
By: Federico Biancuzzi; Chromatic
Publisher: O'Reilly Media, Inc.
Print ISBN-13: 978-0-596-51517-1