Regarding #2, I believe altlaw.org is exactly such a project. To the best of my knowledge, a screen scraping bot/webapp is the largest clojure project to date.
Thanks for bringing altlaw.org to my attention; lately I've been looking for examples of Clojure being used to do lots of string processing. I've found a presentation of the altlaw project here: http://files.meetup.com/1228907/altlaw-hadoop-meetup-2009-02...
