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I am looking for a collaborative question/answer plugin built in the same sort of style as StackOverflow.
Features I am looking for:
Before you ask, yes I have seen Question and Answer Forum Plugin and WP-Answers but neither have support for collaborative editing.
Templatic has one called Q&A WordPress. Here is the demo.
WPMU's Q&A plugin has almost all the functionality you're looking for -- it uses HTML instead of Markdown. The admin panel lets you assign various capabilities to different roles, including the ability to edit others' questions and answers.
Try Q&A Lite plugin. I could not find it by search on my site plugin install, but downloading the zip and uploading in the admin helped.