A feature I use heavily in charts is the option to show a forecast line. I'll use it see if we are trending the right direction and will meet our goal by a certain date in the future. For example we have 10 widgets ordered on 1/1, 11 ordered on 1/2, 10 ordered on 1/3, and 12 ordered on 1/4. Using a Trendline I can guess we might get 14 orders on 1/12.