Well having dropped 70lbs, then regained 60, my advice should be taken with a grain of salt I guess. But cut out soda. Entirely. Mountain Dew has been my biggest enemy keeping the weight off.
If you have a Trader Joes nearby, the premade salads they have there are surprisingly delicious, low priced, and filling. Even "fancy" ones with chicken and BBQ sauce.
Another thing that helped me was literally spending all my money on maintenance items and not having any left for food, but that's not very healthy in the long run.
Now that the baby has started walking, chasing after her will hopefully help me lose some weight again too. It might not be a bad idea to make a thread like the hotlink thread or something here to post updates in, those of us that need to might be able to use it as motivation to keep going.
The "diet" I was on in California worked well, but there was more than a little physical activity involved as well. It wasn't an actual diet, not something out of a book or anything. Natural juices, not artificially enhanced stuff, lots of meat, and at the very least a salad with every meal. Grilling vegetables, or wrapping them in bacon, does make them much easier to eat. Switching over to baked or air-popped chips as a small snack was a big help as well, and those have the benefit of tasting better as well as staying crunchy longer.
Cutting back on breads and pasta was a big help, although terribly difficult being Italian where spaghetti is treated as an appetizer.
Probably my biggest help was switching from pop to water. But READ THE LABEL on the water, you'd be amazed how many "pure" or "natural" bottled waters are full of salts that actually make you thirstier and stick around in the body.
Fast food at most once a week, more like twice a month or not at all would be best.
Maybe it was a coincidence with the physical activity, but shopping exclusively at Trader Joes, where the prices really aren't that bad and often cheaper than the regular grocery store, on top of actually being organic and not processed to death seemed to help. It sucks where I live now with the closest one an hour away.
I'm back down to 290, for reference. When I moved to CA I was 320, at my lowest before I moved back to PA, I was floating at 245, a weight I hadn't seen since highschool. I'm yoyo-ing from 285 to 300 for the past few months, and really pushing to get back down in the 250 range again. I'd like to see 200 again eventually, but it's not easy.
It will really help if you have people that can work with you or motivate you to go along. I'm terrible at keeping up on things alone, but with a roommate, wife, girlfriend, forum member, whatever going through it with you does make it seem a lot easier, and seems to keep the cheating down.