Originally Posted by Lilbutterflie:
You bring up a good point, Heidi! I just remembered that when I was a teen, I had a big beanbag that I used to punch when I got angry. Perhaps I should get one or make one for my DS; and when his anger gets the best of him let him take it out on the beanbag. 
how about a soccer bopper (if those still exist) or a punching bag (you could make a smaller home-made one, and some kid sized boxing gloves?