Looking for feedback on Mastering AutoCAD MEP 2010 Book

We are fast at work on the 2011 version of Mastering AutoCAD MEP and I figured this would be a great time to solicit some constructive feedback about the book.
First, I do want to thank all of you who have sent in emails with the typos and corrections needed, it is a great help.
So, back to the reason of the post, since we are in the middle of writing the update, are there any suggestions or comments that would help us make the update more useful?

One idea we have been tossing around is creating a set of questions to answer either for each chapter or discipline or functional area to help users gauge what they have learned. So, the question for you is does this sound like a good idea? What format would you like? or any other suggestions would be appreciated.

Thanks
Gregg

Mars in 3D

My buddy Jim Smell tipped me off on this awesome video. WOW is all I can say:



The complete article is here.