f1r3b4ll - 5:57 pm on Feb 4, 2008 (gmt 0)

Yes you can do something about it.

You can put a watermark on your images. By your images, I mean images that you legally own.

If you take a picture from a magazine (or other source), scan it and put it online, you are not the legal owner. You are simply deriving a different use for the image and you should not put a watermark on it.