Surfing the net today, I found this video that purports that it is actually an ice lake that moves the "Sailing Stones." In the last post, the Darn News, piggy-backing on Wikipedia, cited some high-falutin' scientists who wrote pages and pages about how wind could move 700 pound rocks. But a moving picture is worth a bunch of erudite words.
Wind or water? You and these guys be the judge.