Roger Carlson posted a link to this article on Digital Diver. I thought it was worth repeating it here:
http://ronbigelow.com/articles/manipulation/manipulation.htm
Worth a read (whether you agree or not) and I would expect that this would generate some discussion.
I have never heard anyone complain about... non-digital methods of manipulating images. When the same things are done digitally, someone will complain that the image was digitally manipulated. It would appear that it is not the manipulation that bothers them -- it is the newness of the methods that were used to create the manipulation.
Alex