Several useful writings on writing for games

Design A Game is a site on game design and development. It is curated by Pietro Polsinelli, who is a game designer and developer. See all his works here.

I send a mail at most once per month about new games, ideas, experiments concerning game design and learning. Sometimes also contains reviews of particularly interesting indie games. Links to previews of my book, too!

Pietro Polsinelli gives game design workshops, as detailed here.
Just write him to request one.