Block-I/O in Haskell

In the spirit of "release early, release often", I have made a small library available at http://cryp.to/blockio/ ..., which provides a StateT wrapper for IO plus a number of useful primitives to do fast, block-oriented I/O in Haskell. It's by no means complete nor stable nor useful, but it comes with a version of the word-counting program that, on my machine, beats the version from Tomasz Zielonka. :-) It is still under development, but the API should be stable. Hope anyone finds this useful. Peter