I'm not a big fan of smoothies in general - anything that is a "meal replacement" is really not satisfying mentally. It's at best something to keep hunger pangs away. I do recognize, however, that smoothies have a lot of fans - more so than I ever imagined. If you have a blender on your counter, or have thought about making one for yourself, try this interesting pick and choose chart for ingredients.
Do you like smoothies? Do you find them satisfying? Do you have a favorite blend?