People wearing headphones at work has become almost as prevelant as employees instant messaging the person sitting next to them. Many companies are doing away with offices and lowering cubicle walls to create a more collaborative environment, causing workers to pop in their always accessible earphones when they need to concentrate. Some swear by their pink earbuds and Bose QuietComfort headphones, but workplace experts worry that employees are isolating themselves - and hurting the communication companies are trying to encourage.