t’s one of my main interests to create a Web-based application with a WYSIWYG editor that allows working with parts of content, so called microcontent. Imagine integrating text or images from other Web sites into your new content object. This way, knowledge work can become visible online, e.g. showing in a SVG graph the content parts that a document integrated.
Jon Udell has published “Interactive Microcontent” with some thoughts and especially solutions on this aspect.