Hello all! This is more a proof of concept than anything else, but here is my Tetris clone in OCaml! It runs okay under Linux, with OcamlSDL (http://ocamlsdl.sourceforge.net/home.html) Just over 400 lines of code. And only one shape missing :) Code is available here. I haven't tried to run it under Windows, but it should work (the most painful part will be undoubtly to install and compile the dependancies...).

I'll give you credit for using OCAML :)
I have bad memories of OCAML. I only used it once for a compiler class. I must admit I didn't try nearly as hard as I should have.