Due to efficiency constraints, this is only recommended in a development environment when full features are used.
This plugin takes the features of adding custom CSS and Javascript to individual pages to a processing extreme.
This is by creating a custom post type which can activate the CSS and javascript on the basis of the type of page.
The action tags are a custom category tag to which to can attach to pages or posts. The CSS and jquery in the custom post type will then fire when their category tags match. Although a very powerful feature, this does show a weakness in WordPress as the standard query to check for this is pretty inefficient and the query takes longer than you really want on a production site.