Box.net has added new collaboration features and real-time notification capabilities. The Palo Alto, California, company will start making available a beta version of the revamped application to users on Thursday. The new user interface features significantly more space for viewing content, while a new collaboration capability will let users engage in threaded discussions within folders. Forrester Research analyst: “Box.net places a premium on user experience as a differentiator and recognizes the need to continue to invest in that area of differentiation””]