Watermarks will do no good. There are programs out there that will delete your watermarks, just ask Durka Durka. MO stole lots of his pictures.
On a side note that I thought was pretty funny. As we crossed the border M.O. was on weatherman talking to himself. He would call offroad1 as bajaracingnews and then answer himself as offroad1. He kept this up for awhile. Having differant conversations with himself. The funny part is he didn't change his voice so we could tell it was one person. Then as I was trying to locate a lost vehicle in our group he kept saying "RDC ripoff". What an idiot.
There are ways to digitally "watermark" photos if you will - It becomes invisible and a part of the digital signature - I don't know the details, but maybe there is a computer whiz that could answer that....
Hey Cadewell something useful you could do is take all the pictures and articles from Mikes' site and post them on yours. That way if people are interested in seeing the material, they could just go to your site rather than giving Mike the extra traffic..