I am typically not one to use image manipulation programs (Photoshop, GIMP, etc.) to enhance my photographs. I believe in a natural preservation of the way things are when I'm painting with light. Althea Hendricksen would agree with me fully.
However, there are situations in which I will give in to photo-editing: (1) if my client asks for the removal of a coincidental blemish, or (2) for the sake of artistic touch. However, in the sense of artistic touch, I believe the photographer should always be clear and honest about the manipulation.