You guys might like this article by the folks at the National Weight Control Registry, who research what it is that successful maintainers DO, in order to keep the weight off:

http://www.rimed.org/medhealthri/2009-02/2009-02-53.pdf

In summary:

Here are the best predictors of keeping weight off:

1. Longer duration of weight loss maintenance (more than 2 years)
2. Dietary consistency
3. Less fast food consumption
4. Less TV viewing
5. More frequent breakfast consumption
6. Lower levels of depressive symptoms and dis-inhibited eating

Key behaviors associated with weight maintenance are:

1. Activity levels of over 200 minutes per week (at least for women in the cited study)
2. High levels of dietary restraint, such as:
- Deliberately taking small helpings
- Avoiding certain foods
- Counting calories
3. Having lower levels of depressive symptomology
4. Controlling overeating

:-)

It's important to note that these are the behaviors and predictors most frequently associated with maintenance. It doesn't mean that all successful maintainers do all of them, or that someone can't succeed using different strategies. These are just the most common ones.