I find the social bookmarks particularly interesting. You can see who has been reading an article that you are interested in, then you can see what else they have been reading.
http://lyris.education.tas.gov.au:8080/read/?forum=gamemaker The world's first forum on game creation in schools. Australian based, focus on pedagogy, Gamemaker and Klik&Play. Interesting history.
http://www.groups.edna.edu.au/course/view.php?id=81 Game Making. Australian forum, pedagogy & game creation (currently very active)
http://www.learningplace.com.au/deliver/content.asp?pid=24029 Games in Learning. Australian forum, covers game playing and game creation
http://www.gamelearning.net/ UK based forum, game playing and creation
My other subscriptions
http://lists.becta.org.uk/mailman/private/gamesandeducation/ UK based, mainly game playing
firstname.lastname@example.org Serious Games. USA, mainly game playing, strong representation from software houses (currently very active)
http://www.groups.edna.edu.au/course/view.php?id=639 Games as Pedagogy Australian based, game playing