the best flash-driven site that I've found, that has a message board, is shockfusion, but compare flashkit and shockfusion on a functional level.. basically shockfusion is incredibly ambitious in my humble opinion but really really limited..
it's definitely a nice idea, but I'm basically agreeing with everyone else already at this pint. ..point.
flash is better for small things that only need to be maintained with new txt files, more or less.