Thanks for linking that Lynne. He certainly deserves the A. That article was well researched and persuasively written.
After the NRA president blamed video games recently as a cause of violent behavior, I did a little looking and I am personally unconvinced of the link. Most studies that claim to link the two actually measure unrelated proxies for aggression (like the likelihood a study participant will pop a balloon if given the opportunity). As I understand it, most statistical studies that measure actual incidents of violence see either no correlation or a negative correlation to video game use. It's actually a very difficult problem to study effectively.
I think Scott's conclusion stands, however. Monitor the content that goes into your head and you'll be better off.