As someone who tends to spend a fair amount of travel time in some of the world's major cities, I am following with fascination a recent survey by the International Herald Tribune (in conjunction with a magazine I have never heard of called Monocle) that rates cities for their quality of life. You can check out the list youself online. For what it's worth, I have been to fifteen of the top twenty cities listed and while I would quibble a bit with the order, this is not a bad list.