It was on this board a while ago, but I don't remember who flagged it first.

I think the movie "Crow" was the first one where special effects filled in for the death of the star for several scenes. And that was conventional effects. It would be a lot easier now. Go through the effects reels of the "Lord of the Rings" DVDs. There were a number of shots where a person's face was pasted onto another actor's.

You are right that photographs, and even movies, have become very suspect. I remember National Geographic having their head handed to them once for "fixing" a shot of the Pyramids on the cover. They swore they would never do this again without clearly mentioning it. I still assume that experts can pick a digitally altered picture out, but that's sort of taken on faith.