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.
tutorial.math.lamar.edu
Covers the basic materials for algebra, calculus, and differential equations. Includes examples, review questions, common errors, study tips and formula tables(PDF). Materials are available for download.