Greetings Max,
Yes, the White Paper on Outlook is worth the money. If you like to keep things simple, don't want to add any extra software (like the GTD Outlook Add-in), and are a regular Outlook user, then you will find the paper excellent. It is like David's stuff in general; not complex but clean and simple, and easy to grasp and maintain - organized common-sense. It used to sell for thirty dollars, and people said it was worth it back then...
Best Wishes,
Gordon