I have read, surfed, and experimented and have become a pretty good brewer.
However. . .
Since my recient transition to all grain brewing I get more uptight that I am not doing things exactly correct. Reading is not the same as observing it being done.
I have gotten good advice from the beertools forum and have surfed the sight for a long time. I would trust a demonstration DVD produced by the beertools folks.
I won't even ask for royalties if you make any money on it

Seriously,
I don't think I am alone. Especially for the brewers who are past the beginner stage and are starting to experiment, a DVD with proper techniques at all levels would help us not make new mistakes on top of the bad habits we developed learning on our own.