Cool site, nice pictures. The banner text is a little blurry for my old eyes.
As for protecting images, I have not come across any method to do so. If I want an image and right clicking is disabled, all I do is hit PRINT SCREEN and paste it into my graphics editor. I then crop around the image to get what I want. Takes less than 10 seconds so it's not too big of a hassle.
I would consider watermarking them images so people know where they at least come from.