I agree with the keep plugging along and such, but cutting out dietary fat is actually not beneficial for losing body fat. Research has shown that individuals who maintain higher fat diets while losing weight lose it faster and are generally as healthy or healthier than individuals with higher carb diets.
My advice: cut processed carbs out of your diet, take up or increase the intensity on resistance training, and log all your food intake religiously. Read the fat loss sticky for details on all of these.
Also, just to clear it up, doing ab exercises isn't going to help you lose the fat at that location. Research has shown that you can't reduce body fat from a specific area just by working the muscles adjacent to that area. You have to reduce overall body fat to reduce stomach fat.