Zervaas explains how to create sortable lists with PHP and Ajax, it’s the drag drop sytem like in common ajax desktops like pageflakes, netvibes .

This article covers the implementation of a system that lets you easily define the order of such a list.

Traditionally, implementations of such functionality involve you clicking a “move up”, “move down”, “move to top”, or “move to bottom” button that switches the order the items (one item at a time). Or perhaps each item has a text box with a number in it, that by changing the numbers you can change the order of the list.