See:
http://www.npr.org/templates/story/story.php?storyId=124367058&ft=1&f=1001
I think that this subject needs much more research as it could lead to huge breakthroughs in our understanding of how things work. If the placebo effect gets stronger, then medical development may simply halt as the objective basis of any new pill evaporates into statistical noise.
I believe that psychic phenomena is real and that the placebo effect may be part of it. There are weird examples of doctors making remarks about 'use this pill while it still works' as sort of a half serious joke. And there are examples of drugs that were verified as to effect that later seem to have become ineffective generally. Fraud? Bad research? Probably....... but who knows?
metatron