I just started reading this and I like it. It is very similar to GTD, simple and effective. I highly recommend it.
It basically reinforces what we all probably already know, that you alone control how you respond to outside stimuli. He has some nice tools too, mainly a simple worksheet. It reminds me a lot of GTD. I read all of the author's blog entries since he started blogging in July 2010. The author is Andrew Bernstein.