This tutorial explains how to display a list of items from a database that can be reordered in real time by dragging and dropping, using the jQuery library. Moreover, no page reload is required on every reorder. If you want a bigger introduction to why you may want to do this I suggest reading my tutorial on how to achieve the same functionality using scriptaculous.
Previously I have explained how to achieve this in Scriptaculous and Mootools.
» Read more: Drag and drop reordering of database fields (sortables) with jQuery