This one is of interest to me especially since I am getting closer to finishing my second chapter for the Enterprise Library book. I can't vouch for the Hands on Labs yet, since I just finished installing it, but they should be cool. Check it out.
Enterprise Library 2.0 Hands on Labs
Update: I took a quick look around and found that this is a great place to start for those who don't know the Enterprise Library. It isn't going to impress any advanced users, but it is still very cool.