[stolen from Randy Crawford crwfrdDESPAM@umich.edu:] 

"A single number that assesses a CS department's worth across the
spectrum of AI topics has increasingly less meaning as you descend the
rankings.  Few schools can claim to have outstanding profs that
represent all areas in AI.  Perhaps no schools can.  As you descend
through school reputations from CMU/MIT/Stanford/UC Berkeley down, you
lose breadth as much as excellence.  It then becomes increasingly
important that you clearly define the subtopic in AI that you want
ranked...  What's more, reputations can change quickly.  Ten years ago
Yale was among the best in AI, and five years ago, Chicago was quite
strong.  Today, not."

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