Matthieu Mezil is presenting on Entity Framework and LINQ (and VSTO) at next week's first (?) .NET event in Paris: TechDays 2008.
I wanted to see what else was going on and found the website (by BrainSonic) and boy is this a fantastic Silverlight implementation. Even if you don't know French, I highly recommend checking out the website, if for no other reason than to be inspired!
This is just but a small tidbit. After searching for Mezil, it spun (literally) these three items on to the calendar.

There's more, but I'll let you go play with it yourself.
Matthieu has been building up his EF expertise as well as using the forums as a means to challenge himself to learning more and sharing what he's learned.