[racket] another mini-tutorial: a racket slice: munging IRC logs

I'm thinking of writing a series called "Racket Slices", which does a
cookbook-style approach to learning about Racket.  I think there's a
need for documentation that takes a "slice", a cross section of Racket
to do some simple (but real-world!) task.  And since we're using the
name "Racket", it demands that we use a pun about tennis.

Here's what I'm thinking of:

    http://hashcollision.org/racket-slices/irc-parsing/index.html


How does it look?