I was planning to write some tips on how photographers can protect their images on the Internet, but then Dennis Rito beat me to it, and probably has better advice. Dennis and I, and three other photographers, form a core group that’s working for the establishment of a community to protect the rights of photographers.
Here are Dennis’ tips:
http://dennisrito.blogspot.com/2007/07/tips-for-protecting-your-images.html