An activity timeline outlining what has changed and by who
I feel that we really need to pick up our game when it comes to user collaboration within the CMS. Giving users more visibility of what's happening within their site. A simplified version of this has been done as part of the dashboard module but I'm envisioning this to have more detail about who edited what and when with more visual context.
It would be good if users can see if they have missed out on anything, follow up on an individuals activity, or the activity of a page (overlaps with history of a page).
I see this heavily tied into some sort of a notification system (eg. three recent changes to this page).
I've personally had some good experiences using invisionapp.com were you feel like you are part of a team, contributing to a bigger thing and being aware of what is going on with the site rather being in your own silo.
There are several open source timelines - there is a silverstirpe module too.
However the one we have used it http://almende.github.io/chap-links-library/ and it relies on our internal audit logging - which is similar to one I've seen but haven't found in the last 10 mins of seraching.
Have you release this timeline out as an open source module Barry?
+1 for this, we have actually implemented this for our system and some user actions customers have liked it