There is a great entry on smoothies over on Knit Fit. It's been ages since I had a juice or a smoothie and possibly months since I had a green smoothie. My problem with juicing and blending is the noise of the machines; there seems to always be someone in bed in our house because of shift patterns, so I can't just make a juice when I feel like it. So that I can make juice in advance but keep as much nutrition as possible I've bought some thermos flasks to freeze while empty, fill with juice and then store in the fridge. This works quite well with juice but not so good with smoothies. I need to experiment more, maybe get a wide necked flask for smoothies.