Rules-writing guidelines

Michael Keller over at GameDesignerWannabe.com has some notes from a GenCon seminar by a Hasbro executive named Mike Gray about writing effective and useful rules documents for your game. The notes and tips are interesting and very specific - I wish I'd been able to attend the seminar. Definitely worth a look, and includes a copy of a summary handout from the seminar which is also concise and useful.