"Genetic doping" to debut at Beijing Olympics?

Performance-enhancing drugs for atheletes? Soooo last century, man, get with the program. The next big scandal destined to hit the world of professional sports may well be “genetic doping” – using drugs that hack human DNA to increase athletic endurance and stamina. This reminds me somewhat of a post from Csven Johnson at reBang, in reponse to an earlier NYT item about athletes whose prostetic limbs are considered to be augmentations. As it becomes increasingly possible (and indeed acceptable) to hack the human body, how will we draw the lines of what is acceptable under certain circumstances?