Coca Cola Zero
I'm not sure it's a good sign for Coke's marketing department when I have to hit the Wikipedia page to figure out what the hell their low-calorie least-nasty tasting cola product is.
I'm trying Coca-Cola Zero now (the zero is for zero sugar and zero calories) and trying to ignore the high price and slightly medicinal flavor. Pepsi's new low calorie offering is Pepsi Max (the max is for the MAXIMUM in low calories) so maybe I'll try that one if this doesn't pan out.
One thing I didn't know is that Pepsi was originally called "Brad's drink". I think this is pretty important information.