If you do cardio in the morning it does really kick start your metabolism, and if you do weight in the evening you are able to lift more due to hormones, as well as another metabolism hit, so your doing a double up on your metabolism this way. You hit it in the morning and get it running hard, and then in the late afternoon/evening you do weights and push it up some more. It's been recorded that when people do this, they can burn an extra 2-300 calories a day, not including what you burned in your workouts just that's how much more your metabolism raises from boosting it twice. Which is another very nice benifit.
Kit