To say that there aren't any games that are the equivalent of literature is incorrect. There are several recent example of game that can challenge adults the same was a classic piece of written work do.
URL="http://www.esquire.com/features/best-and-brightest-2008/future-of-video-game-design-1208"][/url]
Great podcast by the ways guys. I found it thanks to Gaf and so far its the only cast about video games I can stand to listen to since GFW Radio ended. Keep up the good work.