Smart Lists is now available as a jQuery plugin as well as a Prototype-Scriptaculous extension.

Smart Lists is light-weight (8KB) script that converts “flat” HTML lists of information into categorized, paginated lists. In essence, it’s a presentation layer for improving the readability of static information, without need of a database or server-side script. It can be applied to existing lists of information with very little work, providing a significant bump in usability.

You can learn more about the script here.