I have found since reaching my goal weight of 125, that if you add more protein, work out with weights at least 3 times per week and get aerobics in (30 minutes) two to three times per week, get 6 to 8 glasses of water, and increase your calories to somewhere between 1500 and 1800 and meet your protein, fat, and carb requirements, it is easy to maintain your weight.
If you don't increase your calories, you will continue to lose. I am actually 3 pounds under my goal weight (122). It is important to get your protein up there (80 grams of protein) per day is great. Drink plenty of fluid before, during, and after workouts.