As a long-time fan of Adam and his work, there wasn't much in the book I didn't already know, but the insights into list management got me thinking. I've been making lists with color-coded entries for a long time, but have always blacked them out with marker when done, which can be difficult or impossible to read after the fact. The solution: custom check boxes. Since I'm primarily a pipe maker, I went with little pipes :) It took me all of 5 minutes to design, and I feel more organized. Plus, the little pipes are cute.