After reading James Gurney post about how to eliminate the middle value I decided to try it out for myself. I very much enjoyed just breaking down everything to just black and white. It really helped me see the bigger shapes and get a better sense of light direction. And I love applying it to watercolor it just makes everything easier. I'll put this tool in my bag of tricks when I'm out drawing from now on. Rock on.
Here are a couple of pages from my sketchbook where I tried the technique. Some parts I cheated and added some middle value but for the most part I stayed true.