Interval running is great 50, 200, 400, 800 and 1500m intervals. Mix it up, I usually do a set of either 200-1500m intervals and a set of 50m or tabata's at the end to finish it off. It will improve your wind dramatically. Other than that, punchout drills on the bag, tabata punching on the heavy bag. Have a look through peoples training logs for ideas