http://www.yourmedicaldetective.com/public/463print.cfm

This article illustrates an exercise model that has been receiving more attention lately. I've studied and used High Intensity Interval Training (HIIT) in the past with good results. I'm a firm believer that HIIT is more effective than extended cardio sessions performed while staying in your "target" zone. HIIT conditions your heart and other muscles to use oxygen more efficiently. Studies have shown that HIIT makes your mitochondria (the structures in your cells responsible for energy production) incinerate more fat for energy. You burn less calories during a 20-minute HIIT session than you would while performing 45 minutes of fixed intensity cardio. But your metabolic rate will be higher and you'll burn more fat overall after using the HIIT method of exercise.

Incorporating this method of training with your regular weight training routine and healthy eating habits should help you shed fat even faster.