The shots below were taken on Saturday 3rd december 2011 using a Canon 50D ISO 200. f/5.6, 1/1000sec @250mm, +2/3 EV [overcast, wind approx 35 mph, light horrible]
I asked Pete [the kite surfer] If he saw anything, but his reply was "...I was concentrating on the trick"
The 1st shot shows the "object" and the previous 5 shots [the 50D does 6.5 shots/sec] show the "object as a brilliant white light. These are straight outta the camera, apart from resizing for web, and are not, clouds, swamp gas, superman, or birds. I do this for a living, so do know the difference