I use to use that for note taking. It did help with memorizing the notes and redirects the doodleing tendancies.
As for breaking writer's block, I usully go with what an old professor once taught me. Just write. Even if all you can write is "I can't think of anything to write" over and over.
Eventally, a coherant peice starts to form. Then I go back and read and see where the article really "starts" in the rambling. It works for me every time.