Wiki change history
I like the idea of having change history for wiki pages so that you can see what has been changed and by who. Otherwise you don't really know what has changed since the last time you read it. Then you could also have a subscribe/follow function so that you get notified when something changes (but maybe with a longer delay than chat message notifications so that you won't get to many).
In today's Agile world, many documents are living documents. We need the velocity of collaborating on a wiki, making continual, live updates to reference materials, combined with the traceability of who made what changes when. The wiki is awesome for velocity, but terrible if you require any sort of accountability.
I REALLY need this too. I created a wiki for team members to log agenda items for an upcoming meeting - and people responded. Unfortunately I can't follow up with the individual contributors to clarify their points because I can't see who added what.
So I guess it's back to just blasting out a team email and collating the individual responses MANUALLY. Seems like a lost opportunity.
We just had a problem where one of my colleagues accidentally deleted some of our documentation and didn't realize that they had made this mistake until the next day. It would be really nice if we could undo changes after the fact.