Keep track of your calories in versus calories out and try to maintain the deficit you need.
Add some strength training to your exercise plan if you're not already doing it...a balance between cardio and strength is your best attack for belly fat.
Also, incorporating a good amount (20-30% of daily calories) of healthy fat (poly- and monounsaturated) into your diet has been shown to help with belly fat.
Make sure you get a good amount of protein, too, though the "right" amount varies for everyone.
Drink water, drink water, drink water!
Good luck! If you poke around the site, you will see lots of posts with ideas and what worked (and didn't) for other folks.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days