This is a demo of how you can create boxes, in this case news feeds, and let the user define where the boxes are placed on the screen. i really like the way the boxes have highlighted areas that you can move them to. Letting users place them anywhere at all just seems a bit silly but this way you can give them a heads up on where they can be placed :
Draggable Boxes Demo
It is furthermore explained here in detail :
How To Do It Details