Killer Sudoku, Difficulty 3

Puzzle 3441 May 14 May 2011
Puzzle 3446 May 15 May 2011
Puzzle 3451 May 16 May 2011
Puzzle 3456 May 17 May 2011
Puzzle 3461 May 18 May 2011
Puzzle 3466 May 19 May 2011
Puzzle 3471 May 20 May 2011
Puzzle 3476 May 21 May 2011
Puzzle 3480 May 22 May 2011
Puzzle 3485 May 23 May 2011
Daily Killer Sudoku