I found another wonderful book on mindfulness, which is perhaps different from any you might have seen before. It's called Mindfulness: A Practical Guide to Awakening by Joseph Goldstein.
The author takes the Satipatthana Sutta, the Buddha's discourse on the four foundations of mindfulness, as his source and expands on a brief section with every chapter. It's a bit like reading lectures based on a founding text. Not only does Goldstein explain some of the more hidden meanings of the text, but he gives real, humble examples from his life about the challenges of developing mindfulness. He also gives some ideas about techniques that will help the mind become less chatty and more aware.
I saw that he wrote other books about the benefits of mindfulness and some guided practices in developing mindfulness. If you are interested, they might be good to check out.