I think this is the doc's cam, isn't it? It could be human motion, depending on how fast the speed of the cam is. I don't understand these things too well, but I know that the Queen Mary cam has a very slow shutter speed, and people walking about look to be ghostly smudges, too.
I am thinking of starting a free banner exchange for anyone with a paranormal website. If you think this is a good idea then let me know. If there is enough interest I'd start it up.