Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
lexicode
Lexicographic coes or lexicodes are greedily generated error-correcting codes with remarkably good properties. They were produced independently by Levenshtein and Conway and Sloane and are known to be linear over some finite fields.