I've promised myself that sometime very soon I will branch out from spinach and start adding more adventurous greens to my smoothies. I have recently been thinking I would really like to have a juicer too so that I don't have to have icy smoothies all the time.
I recently read Green for Life by Victoria Boutenko. It's full of great information on nutrition, the benefits of chlorophyll, recipes for green smoothies, etc. Looks like an updated version is on its way out-- I highly recommend it!