I've been reading a lot about this recently, because I do find that moneymakes me happy. But so do other things, and because I'm about to enter a very high-pressure, high-income career, I wanted some kind of benchmark so I don't get swept away with earning tons of money at the expense of my health.
[Fully expecting Costello to sweep by with the whitewhine website again; I do deserve it!]

I read this book, Affluenza by Oliver James:
http://www.amazon.co.uk/Affluenza-Ol...s/dp/009190010
It had a few good points on this. For the most part I don't recommend it, most of what he says is introspective ******** and he tends to make bizarre sexist comments.