Great posts Onyx!

N2L I have to burn 500 cals a day exercise wise. Takes me an hour. I have a polar and I LOVE LOVE LOVE it!!
I don't take any notice of the 'zones'. They don't really mean a lot.
If you have a HRM, workout to the 500 cal mark and don't worry too much about your heart rate. You'll learn after having the HRM for a while where you need to be to get the most out of your trainings. On Saturdays with the program I'm doing, we do a 1000 cal burn and have Sunday's off - no training.

I don't eat back my calories. EVER. Defeats the purpose of exercise and you may as well just eat right and not exercise at all IYKWIM.