This Site let's you generate killer sudokus and shows at least one solution of them. If you want to find out all possible solutions, just goto "Show all"
As a fun fact, most of the randomly generated got more then one solution, say it is undetermined. If your computer is strong enough to solve a 16x16 killer sudoku, please leave me a message! I have spend a lot of time in optimizing solving algorithms, but somehow it fails on CPU power ... Printing and Generating was the simple part.