That is one of the coolest articles on Haskell I've seen in a while. Touches on most things I find interesting: data parsing, signal analysis, compression, and a realistic implementation of a not-so-trivial program.
Cool article! I took a class on compression about a year ago and taught myself Scheme by implementing the algorithms in it. Functional style really worked well with those algorithms.
I also found this literate source while looking for that paper again; cool! http://www.imperialviolet.org/binary/jpeg/