sudoku, killer & kakuro

I've finally succumbed and purchased a book of kakuro.
I manage to get a daily fix of killer from The Times, and also a couple of sudoku although I don't always bother unless I'm really too quick on the killer. But finding a daily fix of kakuro is still challenging, without forking out for the print version of the Grauniad.
I actually find kakuro the most stimulating of the number puzzles now as I haven't quite mastered all the logic rules to speed it up. I can complete most of them - eventually. But they require more than just the knowledge that 24 in 3 cells can only be 9/8/7, instead you have to work up to 5 and 6 cells (35, and 39 are what I'd call the reverse triangle numbers for 5 & 6 respectively). You also need to know about the (reverse) triangle numbers +/-1 have only 1 solution eg 4(2) [total of 4 in 2 cells] = 3/1, 7(3)=4/2/1, 11(4)=5/3/2/1 23(3)=9/8/6, 29(4)=9/8/7/5 etc.