This is an excellent and very contemporary question for photographers, I think Karen. For what it's worth, a couple of things strike me about this issue.
As a couple of people have mentioned, good technique is paramount. There are people here at Nikonians who invest so much time in getting the basics taken care of - who learn as much about their camera and what it can do as they can, and it shows in their work.
Their work is invariably of a very high technical standard, and although they apply very skillful and subtle PP to bring out the best in their work, it isn't overstated. I think the best PP is PP you don't notice. I mean we all have to use it, we know it's there in the work, but I like the PP that doesn't smack you in the face.
In saying that, there are obviously Pros (and I can think of several really prominent ones in Australia) who sort of unashamedly use PP to really dramatize their work - their work is distinctly DIGITAL Photography (Peter Eastaway and Christian Fletcher come to mind). I quite like Kah Kit Yoong's (Melbourne) approach to PP - I find it a good balance for the most part. I guess at the end of the day you just find a niche you feel comfortable in.
For my taste, I find the image you posted has just been pushed a little too far. It's a good image that doesn't need to be dressed up quite that much.