One simple thing you can do is exercise the rest of your body. Lean muscle mass burns more calories than fat so you are on the right track. Adjust your cardio work to 20 - 30 minutes three to maybe four days a week first thing in the morning. Wait an hour to an hour and half after your cardio to eat. This will allow the residual bump in your metabolism to use the excess fat. Also....no calories inside of an hour before bed time. This will end up right around your hips.
Search this forum for posts by Plan9. You'll find some really good advice.
There is also a book and web site out by Shawn Phillips who is pictured below. He knows a little something about great abs!
Here is a link to his site:
Best Abs