The Now Habit
Productivity Engineering
Mental Toughness
Do It Now
Getting Things Done
(Personally tested and recommended by the author of this web. Some links might lead to other websites.)
David Allen has a good manual on how to setup MS Outlook for his GTD method.
(Oh yes. MS Outlook. We don't endorse this product, but it is the most widely used one in it's field. Some people don't even have a choice.)