The 4-Hour Work Week (Tim Ferriss) drove at much the same point - you should consider your free time to be part of your wealth. I don't necessarily recommend the book, but it's another viewpoint on the topic.

I think the book is worth reading, although voluntarily provoking, to say the least :)

The author here: this is something I've been willing to share here for months. I hope it will be useful to some here.

Even better, try to live off the income from your capital, rather than just your savings - http://www.wisebread.com/join-the-rentier-class

Thanks for the link. Well it wasn't maybe clear in the article, but I don't intend to live from the income of my savings.

I wanted to point out the fact that one is able to drive his way by tweaking expenses, income and mobility.

But I definitely have a part of my capital that is earning some income :)