Plan Your Cardio Workout (The key to fat burning is using interval workouts)
You can also visit:
http://www.menshealth.com/cda/article.do?site=MensHealth&channel=fitness&category=cardio.activities&conitem=882a99edbbbd201099edbbbd2010cfe793cd____&cm_mmc=AbsDietNL-_-2006_12_01-_-Editors_Column-_-Plan_Your_Cardio_Workout