Ask YC: Anyone built/seen any cool Wikipedia apps? (e.g. WikiScanner)

I'm interested in building some applications that can try to make some sense from a given Wikipedia entry's edit history. There could be some cool integrations with Mechanical Turk or nat'l language eventually, but the basic idea is very simple for now.

- Has anyone seen an app that does something along these lines? (aside from WikiScanner, and more interesting than FoxyTunes Planet) - I could have sworn I heard some noise about a Wikipedia API...was I imagining that? - Does anyone here have a desire to work on a project like this, or have a recommendation of someone who might? - What potential problems do you see in building something that crawls Wikipedia?

This ain't Powerset ;-) ...but could be cool.

Thanks! Hacker News is the shit...