Killer Sudoku

Killer sudoku's are an combination of sudoku's and kakuro's
The rules for regular sudoku aplly, with one additional rule:
The Sum of the cells in a cage must equal the total given for that
cage. Each digit in het cage must be unique

You find killersudokus on:
http://killersudokuonline.com/
and
http://www.djape.net/sudoku/wp/