I agree, I would do cardio after weight training, it's hard for me because I hate cardio, but it's better afterwards. If you can, which I do, I will eat a small portion of protein/carb's right after weights and right before cardio. Nothing heavy just a little something to soak into those repairing muscles.
I do cardio after lifting weights. I heard weight lifting will burn off teh carbs and light cardio afterwards will make your body switch to fat burning. Lifts has a good article about this somewhere but I can't find it.
If your goal is to loose bf then go ahead and do cardio 4-5 times a week 35-45 min per session the days you don't lift you will be able to go a little harder