I was discussing this with cereselle, and she decided that this is a universal enough problem that a support community is in order. Please check out Cranky Savers. To use cereselle's own words, it's a support comm for people trying to change their spending habits. It's not just about how to stop spending money, it's about how to be okay with not spending money.
In addition to offering each other suggestions for what has worked to help us stay on budget, we can offer close-to-real-time support for those days when the desire to "numb out" to the crushing pain of modern life with a little retail therapy gets overwhelming. There are often alternate solutions that will be more constructive. For example, if you have the urge to drop a bunch of cash at Amazon, why not check www.bookmooch.com first?
I know many of you have long since learned the magic of managing your resources wisely, but for those of you how still have a way to go, you're in good company. Join us!