Sorry to say it ladies but it looks like aspartame(nutrasweet), sucralose(splenda and saccharin(sweet n' low) all trigger the same mechanisms that plain ole sugar does in your body. The mechanism I speak of is that of insulin release which is the very hormone we are trying to restrict secretion of on the South Beach Diet. The release of insulin from your pancreas tells your body to store fat!
Now the effects of artificial sweeteners may not produce as LARGE an increase in insulin levels as sugar simply because not as much is used in recipes (they are much sweeter than regular sugar, classified as high intensity sweeteners). This is probably the reason why we still lose weight when consuming these sweeteners, in addition to the fact that we may all metabolize synthetic compounds differently.
The point is this, if we are trying so hard to adjust our diet and are living though relative misery by eating only low carb food, why hinder all these efforts by drinking soda?
I would call myself as addicted to diet soda as the next dieter and have been trying my damnest to wean myself off of it over the last few months. I find it very frightening that I crave it in such a fundamental way (much more then I would ever crave water). So I guess I am just really just trying to convince myself not to fall off the wagon here

Oh, and these artificial sweeteners are in Crystal Light, On the Go, and pretty much everything else that says "Diet" on it.