World's Hardest Sudoku

As reported today in The Age (thanks KJ) the world's hardest Sudoku has been uploaded to a players' forum on sudoku.com.

The puzzle -- known as "AI Escargot" or "AI Etana (Snail)" -- was created by Arto Inkala and it looks a little something like this:

Here's a blank Sudoku grid you can copy the puzzle onto if you're inclined to have a go at it.

Enjoy!