I did 1 1/2hrs brisk walk 4 - 5 times a week as well as doing Weight Watchers (never attendded meetings - I'm not sociable enough) and I lost most of my weight.
Unfortunately I went back to my evil ways, so I'm doing it all over again.
I have tried most diets, but Weight Watchers healthy eating is the only one that truly worked and that I was able to stick to for more than 2 months. It's not really a diet - just teaches you to eat healthy which I think is the best type of program.
I never treated myself while eating properly, cause as soon as I touch something sweet I crave more and can't stop. So for me, I have to stay away from all junkfood items while trying to lose. I really should stay away from them permanantly.
I tried the gym, but I was working my ass off and never lost anything. It's interesting to see how one thing works great for one but not another.