I just found a great port of Hokuto no ken on flash(originally on ps2 jap only) on this website:
It kicks a lot of butt :D
I suggest you to go back one page and download it for maximum resolution.
It was made by the same people as guilty gear, its pretty cool :U
For a fan like me, it's a great find :P Don't forget to change the control or difficulty depending on how good you are :O cauz it starts off at hard mode.