Josh-I posted this on another forum but here it is:
http://stephenholtfitness.com/guest_...r_fat_loss.htm
I realize studies are a dime a dozen but I believe this one to have merit.I've used a similar approach and it has worked great.
Also, look into Tabata intervals.Mens Fitness did an article on it a month or two ago and there is plenty of info on the net.