Is eating black anodizing, which gets scraped off the inside of totally anodized
pots, nourishing, harmless, or harmful?

Links on Teflon:
http://www.deliciousorganics.com/Controversies/potspans.htm

Can Non-Stick Make You Sick?  ABC News, November, 2003 
I personally use cast iron, enameled cast iron, porcelain or ceramic, and glass. 

I don't like anodized aluminum.  Aluminum is a great conductor of heat
and is cheap so many restaurants use it, but it is a poison and
leaches into our foods.  Anodized Aluminum does effectively seal the
chemicals but harsh chemicals are used to create the anodized
aluminum.  In addition, it can scratch easily and then you get the
aluminum and the black stuff (chemicals) into your foods.  And it is
definitely not dishwasher friendly.

Let's look at from the other side:  If there were any evidence that it
could make you sick, I trust that America's contingency fee lawyers to
have made the case, and we would have all heard about it.