Not to keep hammering on Oprah but here is an article, Pessimist Nation, from Slate detailing the results of their Think Negative campaign. This email campaign was started after the following,
Not too long ago, one of your viewers—a woman named Kim—wrote you to announce that she had decided to halt her breast-cancer treatments and heal herself with her mind. Kim had just seen your two shows dedicated to The Secret, the self-help phenomenon that says we shape the world with our thoughts, and she was inspired to bet her life on it.
Some of the emails they have received are great and definitely worth the read. I have sent mine in, have you?
Skeptigator 