I read an awesome post by Tim Ferriss (author of The 4-Hour Workweek), on Time Management Guru-itis: Mark Hurst vs. David Allen and Tim Ferriss. It's quite an interesting analysis, and I think it is pretty accurate and insightful.
One of the interesting differences in Tim's dealio is that it's very much about how you feel as you live your life - not just how productive you are. As Tim puts it:
"Is responding to all inquiries on a moment's notice really success? I would argue it is a reactive mode that precludes life, at least the type of life I want to have."
I must admit, this is one of the things I often struggle with. Getting my balance slider bar set to the right setting is tricky. Why? Well, the optimum setting for balance can vary depending on the demands (or lack thereof) stemming from work, personal life, etc. There is the flip side, as well, in which you "impose" a balance setting on your life, then make your activities fit that setting.
Ferriss and David Allen (of GTD fame) both offer methods to impose your own balance setting, but they have completely different approaches for how to get there. I've learned tips, techniques, and philosophies from both of them, and I think they have both impacted my thinking far more than I ever expected.