Two things can be learned from The Art of Retouching site. First is nothing you see in print is real. Second is that some photoshop retouchers have no sense of restraint, and sometimes what you see in print has almost no resemblance to the original photo (as if you didn't know that already). Case in point, where's the other half of her chest!?!?!?
Hat tip to Photoshop Disasters for the first link (which is a pretty awesome case of no restraint).