Jon Harrop wrote:
 > Here is a little OCaml program to solve Sudoku puzzles:
 >
 >   http://www.ffconsultancy.com/free/sudoku/
 >

Heh.  My parents showed me a Sudoku puzzle when I last visited them.  I 
solved one just to get a feel for them, then wrote a simple 
constraint/brute force solver in OCaml for fun.  Looks like a lot of us 
have.