GREAT article Meg
Gatsby: My answer to your queries would be this: don't try and overanalyze this, otherwise it'll drive you absolutely nuts!

I've never used DietPower, and I don't really pay attention to the calorie readouts on the cardio machines I use. Most days, I spend a little over an hour in the gym (sometimes an extra 45 min-hr if I have time to do the am Spinning class). Note that the study says
moderate intensity exercise - I would consider that to be more than just a leisurely stroll around the mall, but not running at breakneck speed for an hour

Of course we're all at different levels of fitness - my typical gym cardio session generally consists of a five minute warm up, then 25 minutes of intervals (one minute jog, one minute all-out, one minute jog, one minute all-out - repeat) then a five minute cooldown. Besides the gym, I also ride at least 2/3 x a week (I'd call that moderate - it's really more exercise for Dakota - even though posting the trot can get a bit tiring after awhile, I'd definitely call it moderate!), Pilates and yoga classes 2/3x a week, and walking to as many places as I can. However, if I overanalyze things it'll just make me cuckoo, so I don't. I just know that as long as I'm eating right and exercising, this works for me (and right now I feel I'm in the best shape of my LIFE, definitely!).
The thing for me is - I have to ENJOY the exercise. Rather than finding it a chore, it is a pleasurable, necessary part of my daily routine. I'd suggest that you find something you LOVE to do. Invest in an MP3 player, iPod, or even a CD or tape player, depending on your budget (I'd go with the MP3 or iPOD as you can cram a lot more tunes on one, they're lighter weight, and they don't skip). I myself could not work out without my tunes (I know that Mel enjoys listening to Books On Tape - gotta try that sometime!). Point is - make it FUN.