This was many about developing games specifically for learning English, but certainly you can find ways to use a lot of games for English study. I used to keep a news site with articles releated to this, but it kept getting hacked. Anyway, just searching now, here are a few links:
This teacher uses games to study narative:
wcco.com - Teacher Uses Video Games In English Class
Using games to teach in general, and why it is important:
Grand Haven Tribune - Michigan Newspapers News for West Michigan, Grand Haven, Spring Lake, Holland, Ferrysburg
I don't have more right now, but you can probably find more on Google or by shopping at Amazon