I think the best piece of advice I received since joining SP has been outlined in the following article:
Stop Dieting and Start Living! www.sparkpeople.com/resource/motivation_ar
Skip the diets, the numbers-crunching, the constant fretting over the scale. Embrace healthy living, not short-term dieting, pills, supplements, and such.
This is why I haven't really gained in the past year, even after falling "off the wagon" and not restricting my calories the way I need to actually lose weight. I wasn't losing, but I didn't gain... I just plain maintained.
It's not a journey of perfection, and it's not even about the scale. It's about how I feel, how I look, and how I live. No more, no less.