For us it will be very usefull to have this 2 additional features on activity log (collaboration).
1) Now we can see when anybody edit a context on task.
Could you add a field to see wich is the new context?
Of course if you edit a date, you should show the new date and so on.
2) Could you add the possibility to export all the activity log between 2 dates?
That could be usefull for a lot of issues.
For example, if you have a list with all the context used for managing a task we could
Easily DRAW the Process used for solving that task. Great, isn't it?