Making Marks is one of my go to books for new techniques. Right now I am starting to explore Mocha Infusions and Ceramic Ink. I work in low fire and find that his information applicable for any firing range. I've enjoyed his blog and his reader friendly attitude from his first posting. This is the autobiography of an artist who has not hesitated to use all that comes his way to become part of his creativity.
Another excellent book for decorating and using color on clay is Image Transfer on Clay by Paul Andrew Wandless.