I posted on Twitter asking for the name of a particular style guide for TSR-era D&D books. Got a few replies so I thought I'd just collect these in one post. Anyone has some other examples, let me know in the comments and I'll add them.
These guides help you figure out how to make a book look like a certain style that you love. Some folks are not keen on doing this, which is fine. I always talk a big talk about doing it but in the end I tend to go my own way. But I have much respect for people who pull it off nicely.
The best one I know of is A Brief Study of TSR Book Design from Sine Nomine Publishing. This one is fat and filled with delicious information and advice.