I respectfully disagree. The power of positive thinking isn't going to heal a tumor, a scorching case of chlamydia, or schizophrenia. In other words, there is a huge and very meaningful difference between thinking you're feeling better and actually having treated the cause of the pain. It's time that we - collectively, as human beings - put magical thinking aside and start to own up to the fact that we can't simply will away the misfortunes that befall us.
And I respectfully disagree. There have been many cases where there was no cure to what ever tumor, disease or what not and the administration of a placebo did actually physically cure the patient. It not only made them feel better but, got rid of the actual physical illness.
A quick tour on google gave me a quite a few examples of this, unfortunately I'm using chrome and can't copy/paste in the /. comment box.
When we talk about the placebo effect, what we are really saying is that, when we are sick, there are usually two causes to our pain that can function independently of one another. The first is the actual, organic cause - which we can't treat simply by adopting certain beliefs or thinking differently. And the second is psychic pain, which we can.
Once again, there are many proofs that a placebo can actually get rid of real pain. Google is your friend.