This is one of my most enjoyable computer activities. I love fixing a photo. I'm NOT into distorting reality like you'd see in a magazine, but just fixing and enhancing what's already in the photograph.
For businesses, you can see the benefits of not having to take studio shots in a studio. They can be created out of almost any digital photograph with descent resolution. Personally, you can see that an heirloom or historial photo can be preserved and you can make beatiful prints for the whole family.