Creating Modular Interactive User Interfaces with JavaScript
http://www.ibm.com/developerworks/library/wa-aj-rearrange/

Travis, Greg
IBM
2008

Abstract:

Discover a technique that lets you move sections of a Web page using drag-and-drop functions. Different aspects of the interactivity are implemented separately and then composed into a unified whole, allowing for flexible customization that can make your Web users very happy.