>Not 'proof', but there is more and more scientific interest in prayer as a healing method/assist.

Interesting, I came accross these earlier this week:

As delivered in this study, intercessory prayer had no significant effect on specifically defined medical outcomes, regardless of risk status

http://www.mayo.edu/proceedings/2001/dec/7612a1.pdf

SOme say what about the Placebo effect?

The placebo effect may have no scientific basis, according to a study published in this week's New England Journal of Medicine.

http://www.sciam.com/news/052501/1.html

As compared with no treatment, placebo had no significant effect on binary outcomes, regardless of whether these outcomes were subjective or objective.

http://content.nejm.org/cgi/content/short/344/21/1594