[Haskell-cafe] Haskell Pangolins

Hi all, This is just a request for comment - I've written a short Haskell program, intended to demonstrate some of the basic features of the language (how to create a data structure, transform it, and run a user interaction loop). I would like to know if there are any obvious respects in which this program could be simplified, clarified or made more idiomatic. The code may be found here: http://codepoetics.com/code/pangolin.hs thanks, Dominic