Some WikiEngines allow you to edit pages the standard way or append comments in a forum-like way. They are somewhere between "vanilla" wikis and a WikiLikeThing.
Advantages:
- Pages can be locked for edit but still open to comment (AppendOnly).
- UserNames and datestamps are displayed next to comments.
- Users used to forums don't feel lost and get used to the WikiWay gradually.
Disadvantages:
Known examples:
See also: ParagraphWiki
CategoryWiki