I have recently become completely obsessed with Jamba Juice, the best smoothie makers in the history of the world. The one I usually go to is on Michigan Avenue, between Madison and Lake Sts. They have a couple couches where you can sit while you wait for your delicious smoothie, and the service is AMAZING. They employ some of the genuinely sweetest people I've ever seen in my life, and they will remember your name every time you come in. With a very wide selection of fruit/mix combinations, Jamba Juice also gives you a choice of a free "boost" with every smoothie you get. Options include, but are not limited to: protein, energy, fiber, etc., so you feel extra healthy when you drink your smoothie, despite the above-average amount of calories they contain. (This does not include "enlightened" smoothies, which are not made with yogurt and therefore have a much smaller caloric range). If you've never tried Jamba Juice before, I feel I should warn you: you WILL be addicted!