I read an article on explorejournal.com today about a study that was done to test "distant healing". Basically, healing through the power of thought and sent energy. A group of couples were split up and categorized as a "sender" and a "receiver". The sender would lay in one room and concentrate on the receiver (in a different room) for a set period of time, repeated, with breaks of no concentration in between. The results actually came back with a positive change during the concentration periods.
I always knew that the power of thought could heal illness. But I always assumed it was just the will within the patient. It sheds a whole new light on prayer chains.
Link to article: