Google engineer Matt Cutts, in an article (related to the recent AOL acquisition of the Huffington Post) from the New York Times:

“One piece of advice I give to S.E.O. masters is, don’t chase after Google’s algorithm, chase after your best interpretation of what users want, because that’s what Google’s chasing after,” he said.

(Funny enough, I swear the NYT article had a more opaque title last night when I read it. They must have an overnight web editor web-ifying the titles.)