this BBC article mentions a new internet addiction rehab centre whihc is interesting. Also China has made the online games introduce a "fatigue" system for online games that reduces the amount of XP you get after 3 hours until at 5 hours you get none!
http://news.bbc.co.uk/1/hi/programmes/click_online/4887236.stm
http://news.bbc.co.uk/1/hi/programmes/click_online/4887236.stm