It might not matter to a huge number of people here, but the latest free version of Muxman contains some errors. The language codes for Indonesian, Javanese, Hebrew, and Yiddish are incorrect, so if you make DVDs with subtitles (or audio) in those languages using Muxman, your player may or may not be able to identify the language of that track in its language selection menus (some players know about the language code errors and can successfully identify them, others follow the spec more strictly and don't).

I made a customized Muxman executable for Project Threepio which uses the correct codes for these languages, so DVDs have better compatibility on this front. I don't know if you plan to distribute binaries as part of the guide or not, but you could certainly include my customized binary. If not, I suppose you can reference the Project Threepio project thread for people who wanted to get the modified binary.