Perfect examples of MEF construction

Question

Now this is a post we all are (or at least were) searching for. I found this one so useful, that I thought I'd better tell it on.

The best example so far, detailed software example with guiding text, helping you through the process of building MEF applications. If you want, even with exercises:

http://www.codeproject.com/KB/silverlight/PrismTutorial_Part1.aspx?msg=3967005#xx3967005xx

It's the first of a series of three articles. Lots of good stuff!