The Chicago Manual of Style is one of the oldest and most comprehensive English style guides. It's well-respected and widely used in the publishing industry, covering the areas of copy editing, grammar and typesetting.
What would be the closest equivalent for French? What about Canadian French?
Bonus points if you can offer some insider info on what other sources typographers and editors think highly of.
Also, what are some book, magazine or journal publishers that are known to pay special attention to good typography and typesetting?