Hi Steffen,
We don't currently have anything built in to provide that, though we do have created and modified dates in the database.
I've added a request in our project tracker for this. Maybe we can create an rss feed or a module with recently created or updated pages. It won't be a trivial thing to do because we have make sure we honor security permissions (page view roles) and don't show a user any pages he doesn't have permission for.
Best,
Joe