Joanne Jacobs has an entry on how gaming teaches.
Since I have two gamers, I am always glad to hear the good news.
A few weeks ago I sent this Tech Central article to my eldest.
It is an in-depth article. For just one bite, on the question of violence in video games:
Professor Jonathan Freedman of the University of Toronto in an extensive review (2001) of the psychological evidence about video games and violence, notes that while there is evidence that people who like and play video games tend to be more aggressive than those who play and like them less, like addiction, this finding is merely an association that says nothing about the direction of causation. Indeed, more aggressive individuals might be attracted to video games as opposed to influenced by them. Some researchers have suggested that rather than promoting aggression, video games might actually release it.