http://www.sudokugrandmaster.com/
this guy says he makes the best sudokus ever.
Code:
. . 1 | . . . | 9 . .
. 6 5 | 9 7 . | . 4 8
9 7 . | . . 8 | . . .
------+-------+------
. 5 6 | . 2 . | . 2 3
. . . | . . . | . . .
4 . . | . 3 . | 6 . .
------+-------+------
. . . | 3 . . | . 1 9
5 1 . | . 6 9 | 4 3 .
. . 3 | . . . | 5 .
this guy also says he did this puzzle in 19.624 seconds