I like Gerhard's version of this, which is the Weekend Luddite. http://everydaysyste....com/weekendluddite/
The idea is that on the weekend, he doesn't use the PC after breakfast or before supper. So a kind of 12-hr break from the beast.
I also use his No S diet (No S Diet: No snacks, sweets, seconds, except on days that start with S. http://www.nosdiet.com/
) and it's MUCH easier for me than any other diet plan I've tried.
By the way, his "manifesto" includes the rules he uses to create his "Everyday Systems," and they're not bad things to keep in mind as we devise our own answers to our own peculiar problems: http://www.everydaysystems.com/
And I agree with mouser that the goal isn't to become efficient productivity machines; I enjoy puttering on my 'puter and sorting my digital files from this side of the hard drive to that side. It's just that if I do it for hours at a time, then I forget to pay the bills or address my mother's birthday card.
I think David Allen has said in his newsletter that *because* he knows what's on his lists, *because* he knows what his obligations are, he can decide whether to blow them off if he'd rather relax in the yard than work on that project. DA's philosophy is that if you don't have it written down and acknowledged, then your nag-mind will be niggling at you that you've forgotten something. So by writing everything down and checking it regularly, you reassure your mind that everything's taken care of, it won't be forgotten, and then your nag-mind will leave you alone. That's why I'm OK with getting my systems good enough.