On-line gaming is good for you?

I've been avoiding World of Warcraft and the rest of that ilk so far, but maybe I should rethink my priorities?

http://www.marketwire.com/2.0/release.do?id=743230

http://blog.wired.com/games/2007/07/study-online-ga.html

Of course, they also take away from home work time - http://www.freep.com/apps/pbcs.dll/article?AID=/20070702/NEWS06/70702045/1048/SPORTS.