I went to Costco's saturday and they had a demonstration of this super blender by Vitamixer. The rep gave samples. I didn't buy the mixer, but the fruit/vegetable smoothie he made was delicious. He didn't peel anything...but the ingredients were:
-red grapes
-1/2 banana
-1 apple, cored, sliced
-a few carrots

OMG...it was delish. If you throw in some protein powder, I wonder if it would make a good meal replacement? Might be a good breakfast subsitute.