RPG theory & game design online

Mendel Schmiedekamp’s RPG Theory Review blog is a great place for discussion of game theory. In 2009 I’ll be running an interactive “storygame”, which brings me close to ARG or alternative reality gaming. This reminds me of Mark Keavney’s City of If storygaming concept, although my approach lies somewhere between ARG and his version of storygaming. Meanwhile, I’m looking for references to other good rpg theory and game design discussion sites.