If you're looking to get in great cardio shape, endurance training isn't really the best answer. Reason: most endurance training results in staying between a defined range of output and stress on the heart. If you want to maximize your cardio and fat burning potential, work on interval training.
It's really easy. Grab a stopwatch or use the timer on the bike, stairmaster, or whatever, then work intervals. All you need to do then is alternate, randomly, if possible, between low, medium, and high output. In terms of running, it'd be walk, run (not jog, run), and sprint for intervals ranging from 15 secs. up to 1 min. at a time. It all translates easily to bikes or whatever, as you're doing the same with your pace, sprinting, riding a fast pace, or tooling along.
Do this workout for 20 minutes and you'll most likely feel sick, initially, but it takes time to work up to your full potential. It's tough, so I'd only do it 3 times a week, to start and have other days you with lower intensity cardio work.
Also, I'd suggest using an precor elipse machine or a stairmaster, if your joints can take it. And if your joints are a problem, consider investing in some OsteoBiFlex to help you out some. It does work.
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