This book is a summary presentation of the classic productivity tome, Getting Things The Art of Stress-Free Productivity.
David Allen and the "GTD" (Getting Things Done) method is the mainstay of productivity approaches that has stood the test of time. If you're into productivity, you've either read or heard of David Allen. This summary introduces the core concepts of GTD in less than 30 pages.
Matrix All the important stuff, in less than 30 pages!