A Lee Gomes article in the WSJ.com (sub.) demonstrates a fun use of data mining, sources from recently released AOL search files, to show what people are searching for on the Web.
"... excepting prepositions and conjunctions, the most commonly used word in the 17.15 million separate searches was 'free.' If something isn't free,
it better at least be 'new,' as that was the next-most common word. Excluding proper nouns, the next most popular words were 'lyrics,' 'county,' 'school,' 'city,' 'home,' 'state,' 'pictures,' 'music,' 'sale,' 'beach,' 'high,' 'map,' 'center' and 'sex.' "