Thanks to ArtsJournal for this item on The Economist's ranking of the world'sbest universities. It's kind of interesting. The Top Twenty are not terribly surprising. In order, they are: Harvard, Stanford, Cambridge, Berkeley, MIT, Cal Tech, Princeton, Oxford, Columbia, University of Chicago, Yale, Cornell, UC San Diego, Tokyo University, University of Pennsylvania, UCLA, UC San Francisco, University of Wisconsin, and the University of Michigan.
The Economist's source is Chinese: a study from Shanghai Jiao Tong University. A footnote states the rankings are "biased against universities focusing on the humanities and social sciences."