If money doesn't make you happy, you probably aren't spending it right (2010) [pdf]
I was happiest 15 years ago working as a raft guide and traveling the world. I had very little money then, but I was very happy. I got to do what I loved every day. I usually made two large purchases per year (the opposite of what this article suggests) - a kayak and a return ticket to my next destination.I now sit in front of a computer. Earn OK money but not enough to retire on anytime soon (I am in Spain just now, money isn't great here). I guess I make lots more smaller purchases than I did in the old days (though they are usually far less meaningful to me than the large purchases I made back then). I was definitely happier back then.