IMDB use a new pretty smart way to protect the images
They put a new layer on top of the image (dhtml) and in that layer thay fill out the table with a transparent GIF.. that way when the surfer rightclick and saves the image, they save the transparent GIF..
http://www.imdb.com/gallery/ss/0349903/O12D-2266.jpg
they can still do a Viewsource and grap the photo, but it takes time to find th real foto