This is a new sidebar concept I've thought of. This sidebar concept is useful because it help the user organize and clean their desktop, and its also app-centric, which is what gnome-shell is about.
So, this unnamed sidebar concept is easy to use. The user can turn on the sidebar, and see the add task button (the plus). The user types in the name of the task (this appears on the tab), and describes what the task is, just incase they forget...somehow. But they can leave that blank if they want. And with some zeitgeist integration to the gtk file chooser (this thing) the user will be able to add recent work that might be related. And to add some more files later on, you can just drag the file from the desktop or nautilus window or activity journal to the tab.