What do you think about this?
I pretty much agree with Schott,
"In 1662 dowsing was declared to be "superstitious, or rather satanic" by a Jesuit, Gaspar Schott, though he later noted that he wasn't sure that the devil was always responsible for the movement of the rod."
http://en.wikipedia.org/wiki/Dowsing
James Randy thinks it's a hoax. I very much believe it works and I have seen it many many times and have personally done it accurately.