I agree with Zorbs. Burning fat is an all-body process, and unfortunately you can't target where you lose fat from. Energy is delivered to your muscles via the bloodstream, NOT from being absorbed from surrounding fat stores. Specific core exercises (eg. crunches) will build up the core muscles, but will do absolutely nothing about the overlying layer of fat.
What you can do is to continue to reduce your overall body fat though a combination (in decreasing order of effectiveness) of watching your intake, all-body strength training and cardio, and some of it will naturally come off the belly.