Didn't work very well
I tried it on a websudoku evil puzzle and it gave me an error and stopped working, checked it a few times to see if it was entered right and it was... also when I entered an easy puzzle, it still said "error" even though it solved it. I don't know what it is, but something about it isn't working correctly to solve them. I also would like to see it become a flash sudoku game as well as solver, but I can see this being useful.
Over all, it doesn't work. If it is just going to do one thing I expect it to DO that one thing reliably.