Notepad.
What ingva posted here in lj_support (that the Notepad style has been edited to be more *_HEAD-friendly) affects a few tutorials. I only found two, but there may be more: "Changing the title of your journal" and "Specifics on overrides (written by arieanne)." Both of these tutorials were written by opiummmm, so AFAIK only he can edit them. (One downside to having a shared-journal-type format rather than an FAQ-type format.) Can anyone think of any other affected tutorials?