Sling TV is preparing for March Madness with several new features that make it easier to keep tabs on the tournament. It’s adding picture-in-picture viewing on desktop browsers, a new iOS widget and enhanced sports scores.Picture-in-picture lets you watch NCAA Tournament games in the corner of your screen without minimizing whatever you’re supposed to be focused on at work. Sling calls the feature “Side View,” and you can activate it by clicking a button labeled, “Browse your computer while watching video” in the top-right corner of the Sling player in desktop browsers. You can then move the resulting pop-out window around the screen, and it will remain on top of any other active apps or web pages.Sling also added an iOS widget displaying a custom channel list. For example, you can create a widget showing only the channels broadcasting March Madness (ESPN for the women’s tournament; TBS, TNT and truTV for men’s), providing a home screen shortcut to the action. I