After some long neglect, I finally had a reason to use the active_scaffold_sortable plugin again. Getting in to the code, I was ashamed at how broken it was. But, after about an hour of polishing and cleanup, it's good as new and ready to be used again.
Here's a screencast to show you exactly what it is:
See: activescaffold with sorted lists is fun!
Note: the urls for the repositories have been moved since this screencast was made. The new home for active scaffold repositories can be found here: http://github.com/activescaffold.