If you like rich's summaries, consider
getting him/her some more books to read!
Getting Things Done: The Art of Stress-Free Productivity over 1 year ago
I think this is one of the most important ideas you can take from this book “Honing and organizing ideas is a necessary mental discipline.”
David also talks about generating ideas good or bad, however I think bad ideas can be detremental to our overall productivity. In seth godins book The Dip he talks about how we should quit the tasks that have little value or are taking time away from our most positive tasks.
Good to Great: Why Some Companies Make the Leap... and Others Don't over 1 year ago
I have to agree with Jaxson, doing what you love is probably the most important concept I have learned in my life.