Ooh, I've got a couple. I'll just use one for an example though:

http://college.mychances.net/tools/college-choice-matrix.php

This tool is based on ~25,000 college applications and shows you the relative preference for each college. It's not based on direct matchups but instead based on an Elo point system, so that all colleges can be ranked along one dimension (essentially, revealed student preference).

It's rarely used because it's really hard to find on the site. It's also tough to figure out how to choose the schools that show up, instead of just looking at the defaults. It's also possible that college applicants care way less about this sort of thing than I, a processor and curator of their data, do.