The supernova flavor - you know the pink flavor that lost to Voltage - is the best flavor of Mountain Dew I've ever tasted. That was the s**t. But sadly Voltage won ;_;
Baja blast from Taco Bell FTW! It's actually the only flavor I'll even drink. Unless they make a version that tastes identical to Dr.Pepper. Then I'd consider drinking that.
i really liked the Supernova and the limited edition Halo. the Supernova had just a full-bodied fruity taste, and the supernova was just good in every way... haha i remember bring 3 water bottles full of the halo Dew to Cedar Point with meh, got kinda sick of it after hacing to drink so much...
but of the available ones, i like Livewire. orange is my favorite soda flavor, and add it to Mountain Dew? EPIC WIN!