This feature would aggregate the resources and links that have been added to individual lessons under a single tab, Course Resources.
Say I'm teaching a class and in an early lesson I assign a reading. Accordingly, I attach the file in the lesson and create a discussion topic for the lesson. In a later lesson, I assign students to review a website, and accordingly I attach the website and another discussion topic for the lesson. If students want to review the discussion topics, no problem. They just click on the Discussions tab and a list of all discussions appears.
However, if they are looking for a file that I've uploaded or a website address I've linked, they must go to the correct lesson to find it. When November rolls around and they are starting to review things they've done, access to all of the Course Resources from one tab would be an amazingly simple and useful feature.