There is an Englishman called Mark Forster (easy to find through Google) and he has written two books with productivity ideas. One is called "Get Everything Done (and Still Have Time to Play)" and the other is called "Do it Tomorrow". He also has a website and is betatesting (free) a third and fourth system called Autofocus and Day Week Month. They all have good points - it's a matter of finding which ones work best for you. They all work on paper, either a notebook or a desk diary. Autofocus is a good one to start with, very easy.
Rather like YNAB, his approaches are backed up and developed in collaboration with a forum of real life users! What I like about his approaches is that he's very intuitive about why people don't stay on track, and why they procrastinate. A lot of the systems like GTD work great for motivated people but I'm sceptical that they need a system at all!

