I've had flash sites for 8 years or so now, and the company is moving to HTML 5 which is fine. One thing I have liked is that with Flash people cannot easily save your images. Of course they can screenshot, but rarely do. So this cuts down on images floating the internet around by probably 95%.
That said, I did have one meeting years ago with a magazine editor who noticed he could not save the image, and said he really liked being able to drag images to the desktop. I should have picked his brain on that issue, but I had other things on my mind..
For now, I may have the option on the new html5 sites to disable the right click. If you disable saving images, from your conversations with creatives, might you lose jobs... in that some wont be keeping your images in their little saved folders to review later? I wonder....