ARGGH. I've gone as far as having to tell someone in a pharmacy (not Boots) that "if i wanted a placebo effect I'd probably have got it with paracetamol".
Placebo effect is very powerful, "whole person" medicine is very very important, and a bit of hand-holding can make a surprising number of aches and pains and sniffles seem unimportant. Also, a slightly scary amount of modern medicine isn't based on a whole lot of strong or well-tested evidence. Most people in western medicine would agree with this, and most NHS employees would add the rider "but we can't afford to do it because the system is at breaking point".
However, by definition, there's no evidence that placebos work, so if you want to intervene effectively, do it with something where there's actual evidence.
Haven't read the whole thread, but check out Sense about Science's website re homeopathy, acupuncture etc vs. evidence.
There is good evidence that some applications of acupuncture are doing something to do with neuroimmunomodulation, i.e. it works kind of, but we don't know how. There is good evidence that some herbal remedies do do quite potent stuff (but there are issues to do with regulation of contents and dosages, not to mention the lack of ability of people to identify the right plant in the first place, which is an increasingly massive problem in many parts of the world). Most doctors who know anything about the subject would admit that traditional chinese medicine (combination of various therapies) seems to get further in treating patients with long-term inflammation-related conditions, than traditional western medicine, but most would also agree that we don't know much about what's going on there.
NettleTea is right about woo woo therapies though... there is evidence linking homeopathy to the placebo effect but not much else... If they weren't actively dangerous in trying to replace real medicine (I'm another one who has had asthma treated with sugar pellets) I'd just put them in a class with hairdressers and interior designers - they can do something you could do for yourself, but they make you feel better about it (and make you part with a lot of money, which could possibly be related).
Frankly I'd put a copy of the Ernst/Singh book in the medicine cabinet at home (remove much other stuff to make room for it) and use it to decide whether any specific ailment needs
(0) an ambulance [get away from the medicine cabinet now then]
(1) real medicine
(2) a placebo and some hugs
(3) a bit of HTFU [to put it somewhat bluntly].
BTW seeker I like your version of complimentary medicine. 