This is a fascinating TED talk by Michael Norton about how our use of money can help to make us happy. This is based on psychological research and confirms what Christians have always understood (or should have done!) – that wealth is a snare, and that generosity in relationships is part of what it means to be fully human, that is being made in God’s image.
The article from CNN which Michael Norton refers to is here. There are an awful lot of comments, many (though far from all) of which make for depressing reading.