I know this topic is being beaten to death these days, but IGN posted an article that seems rather unbias in both respects (or maybe I just didnt read enough into it).
The Impact of Violent VideogamesShould we prevent children from playing them?
by Erik Brudvig
March 1, 2006 - Violent media has existed as long as human history and the debate over how or when to control it is as hotly contested as ever. With the trend towards greater realism and graphic content that began in the 90's, videogames have found themselves the focal point du jour. But how much of an impact have these violent videogames had? We'll take a look at the psychological, political, and economic issues surrounding violent videogames and try to make sense of it all. No matter which side of the fence you sit on this argument, it is important to know the facts...
http://ps2.ign.com/articles/692/692846p1.html
discuss (that is, if there is anything left to discuss...)