Really amazing analysis of business, interpersonal communications, and life coming out of ribbonfarm.com.
In particular, this latest piece on capital is brilliance.
My conception of money completely changed in the years and months leading up to work Posterous. The bargain when working as an employee is completely different. Its very easy to spend money like water when times are good and you've got a steady, reliable, and more than adequate. Its a renewable resource that in the moment seems to be infinite.
But if you want to make it on your own, you can't look at each dollar as something to be spent on your own happiness. That latte won't really make you happy. The only thing that may really make you happy is to be able to reinvest the money into yourself. It is, as Venkatesh points out above, building material for your dreams.