Yesterday, J Gray (the Line Developer for Castle Falkenstein here at Fat Goblin Games, but also an accomplished editor and layout designer for many other publishers) made a Facebook post with advice about turning over clean copy manuscripts that are easier for the person doing layout...
This lead to a number of designers, publishers, and others Liking and commenting on his thread and ultimately a discussion came up about the Fat Goblin Game Style Guide, which is one J has had to use extensively while working here at Fat Goblin Games. While we have a different, internal-only document for the Fat Goblin Hoarde written by The Janitor and myself, The Fattest Goblin of Them All has allowed us to take a page from Owen KC Stephen (whom has had his Rogue Genius Games Style Guide and Writer Guidelines available online for a very long time, and they were the starting point for our own Style Guide) so that we can release a version to the world. The single, full document is available via Google Doc/Google Drive here, but is also online in two parts:
It has always been a core component of Fat Goblin Games to try to help foster not just "good" Third Party Publishing and Indie Game Publishing, but hopefully GREAT publishing in those fields. Rick Hershey, the Fattest Goblin Himself-Himself, is an accomplished artist and writer but via Fat Goblin Games, he's also one of the largest purveyors of stock art and stock designs from not only himself, but also artist like Colin Throm, Felipe Gaona, and Elven Tower Cartography.
This Style Guide in combination with something like the Publisher's Choice Fantasy InDesign Template, should give even a total novice to the field of Tabletop Roleplaying Game Publishing a vital leg up. There are of course other great resources from other companies (the Kobold Press Guides, for instance), but those are often more general texts -- these are specific "tools" to actually getting product made.
I hope you enjoy the FGG Style Guide. Please, feel free to take what we've made and "make your own" that fits your company's needs. We might, if enough people request them, share some of our other resources like some example Templates for Class, Race, and Item-focused books/sections/chapters. And if people would like other kinds of "practical guides" we might explore working on those too.
Lucus Palosaari on DriveThruRPG, Facebook, Twitter, Google+ & LinkedIn -- and now on Amazon!
PS -- I feel I'd be remiss if I didn't link here to Liz Court's excellent Section 15 Generator for the Pathfinder Compatibility License. If you want to publish for the Pathfinder Roleplaying Game, this is an invaluable tool!
PPS -- John Reyst of d20pfsrd.com Publishing also collects a great number of Open Gaming Resources as part of his Open Gaming Network here.