In the summer of 2006, this photo ran in the New York Times and is a very important lesson about photojournalism. If you're going to Photoshop a black guy into a Lebanese refugee camp for one of the world's most respected newspapers, at least take the time to really smooth out the edges around his head.
They provide a link to rightwinged.com, which offers a fuller analysis. Basically, the black man in the lower-right corner has a strange outline around his head, which (so rightwinged.com has concluded) is the result of a really bad cut-and-paste job.
I'm not so sure. That outline could also be caused by someone standing behind him. And if it was photoshopped, the photographer did a really good job of blending the guy's head into the photo in every other way (such as lighting and color-tone), making it odd that he would have made a mistake as obvious as forgetting to smooth out the edges around the man's head. Finally, what would have been the point of photoshopping this guy into the picture?
In any case, it's been almost three years since this photo ran in the NY Times, and they haven't yet pulled it from their site, so evidently they don't think it's photoshopped.