When you hover over the Notes menu item, a fly out menu option will appear for Unread Notes. A further fly out menu will appear that will allow you quick access to each of the unread notes.
Once a note is read, you may mark it as unread so that it comes to the attention of others that are accessing this file. To do so, select the note in the Notes list using the check box to the left. Click the Mark As Unread button. You will notice that the status in the Is Read column changes to No.