I haven't done a link dump post in a while and this week I read a bunch of really interesting posts.  Here they are for your perusal.

Kill Ten Rats: Time outweighs the price of entertainment.
Elder Game: Fun loops and gameplay loops.
Systemic Babble: Complex vs elaborate games.
Killed in a Smiling Accident: MMO combat is based too much around the UI.
Killed in a Smiling Accident: Concern for the MMO blogging scene.