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i've started doing light warmups before my workouts, like 10 minutes on the stairs or bike or treadmill. i've found it helps my weightlifting in that i feel a little more energetic throughout. i don't think i would ever do full blown cardio, like 30 minutes, before a workout though. it just doesn't make sense. you'd burn most of the glycogen stored in your muscles i would imagine, leaving nothing for weight training. now that i think about it running after a workout doesn't make sense either. not that i've given it that much thought at this particular moment.
either way, i would say do cardio on your non weight training days.
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