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.
EMACS: The Extensible, Customizable Display Editor
Stallman's paper on the original (TECO) Emacs. What it means to be extensible. Why lisp is good for implementing extensible systems.