I started thinking about W/L in terms of rhythm, instead of balance, because it seemed to fit both my work and my desired play more closely. I love to travel and have adventures, and those don't fit in xx minute periods in a day. With that said, I completely agree with Eric's list, and I agree that each needs focused attention day by day, you can't focus on health once in a while any more than you can relationships.
The rhythm thing helps me, though, by making it feel right to take a week or a month off and not think about work, knowing that I will focus again when the time comes for that. Those periods away are instrumental in helping me be productive.
I also made my work closely relate to something I passionately enjoy, and that helps too.