I enjoy reading Damion Schubert's MMO-focused blog Zen of Design.
- The Zen Lexicon is especially recommended.
Peter Molyneux is one of the most ambitious & imaginative designers.
- ...although his games famously often fall short of expectations.
- I share his belief that emergent behavior through Simulation and AI is probably the most interesting area of game development.
- He doesnt blog, but this 2004 podcast is a good starting point.
Paul Tozour is a very smart AI programmer.