Bob Carroll reminds me that you should read the Skeptic Dictionary Newsletter. Really, everyone should, including psychic frauds (sorry for the tautology), new age (rhymes with "sewage") medical scammers, chiropractors, and even the odd astrologer.
Read it and learn. You'll be glad you did-- and probably angry, too.
Hmmm... while spell-checking this entry, my dictionary in the Google task bar knew how to spell "chiropractor". I think that makes me a little sad.