Interval training is one of the best ways to lose weight.
It has been used by fitness coaches in various different sports with great success.
Weight loss has been noticed by athletes and sportsmen tht use interval training and so it will make sense for you to use it to lose weight.
Interval training consists of bursts of exercise such as running or cycling for 30 seconds (at a sprint speed) followed by a period of one to two minutes of slower exercise.
Then you repeat this throughout your exercise period, but taper the bursts of high energy off. So your second burst of fast exerecise would be for 20 seconds and then your third one would be for 10 seconds.
You must of course be careful not to eat the wrong foods so I have free a list of foods for you to avoid whilst on a diet here:
http://dietfitnesshelp.blogspot.com/2010/05/free-report-16-foods-to-avoid-whilst-on.html