Here are several on-line links to the debate on the impact of video games.
http://news.bbc.co.uk/1/hi/technology/6943835.stm
http://www.nmk.co.uk/articles/989
http://www.mcvuk.com/blog/93/Violence-in-video-games-and-its-effect-on-children
http://www.digitalartsonline.co.uk/blogs/index.cfm?blogid=2&entryid=427
http://english.pravda.ru/science/tech/09-03-2010/112517-video_games-0
One side of the argument...
http://www.guardian.co.uk/technology/2006/may/21/news.games
http://www.v3.co.uk/vnunet/news/2216732/scant-evidence-video-games
...and the other
http://www.epilepsy.org.uk/campaigns/lobbying/video-games
http://www.telegraph.co.uk/news/uknews/1967794/Video-games-cause-violence-most-children-admit-to-Ofcom.html