What caused this ghost?
Check out: http://www.flickr.com/photos/newlangsyne/3693412825/
Also, see: http://www.flickr.com/photos/newlangsyne/3693412833/ which was made AFTER the one with the ghost, so the camera is not broken.
It's not created. Personally, I think it's some dust being lit by the sunlight coming through the trees (note the shape up top) and ALSO by the flash, which was used. The next pic was taken from a very slightly different angle, so it may not have caught the mist/dust the same way.
That's my opinion, but this is not your typical orb, so I'm looking for some other ideas.
I was not the photographer and it was not done intentionally. How cool would it be if it was?