A) This is a really great looking set of articles.
B) That guy looks like he could be related to GvR - I did a double-take when I first loaded the page.
Tokenization seems an odd place to start. Still, they look like a good read.
I think this just happened to be the problem he was working on when he was learning Clojure. (Look at the "About Me" section.)
plus if you think about it, you have to do tokenization before you do 'stemming'. I was really excited about finding this because computational linguistics is supposed to be the sort of thing that lisps are really brilliant for.