My two favorites are
Beck Diet Solution by Judith Beck--lots of good stuff about sabotaging thoughts that contribute to weight gain. Can be used with any eating plan.
Mindless Eating by Brian Wansink--fascinating studies about what in our environment stimulates eating--and how to use this information to modify our environment.
I don't know if this is true for anyone else, but if I have several self-help books stacked up by the side of my bed, it's usually a sign that I'm obsessing! A signal to back off on the reading and do something active.