Using wikis to manage a small team's internal documentation and shit is a PITA, particularly because you get into a situation where you need to sort of replicate some formatting on a bunch of different pages but then, whoops, nobody knows how to use the template system in a sane way.

Live preview and some sort of not-shit WYSIWYG would make wikis for small teams much nicer. Then what'd make it even super nicer is lightweight macros and pre-made templates that could be stored in a per-user or per-category way. Like... github, but for wiki-stuff.