Custom Hooks for developers is mostly aimed at other plugin developers and it provides the manage_pages_columns and manage_pages_custom_column hooks, which are not present in WordPress, but have been requested often. The plugin replicates the custom column feature of the manage posts page. The new filters can can be used in the same way as the manage_posts_custom_column action and manage_posts_columns filter provided by WordPress.
The author has also written a tutorial on how to add custom columns to the manage posts screen which also applies to these hooks.
Pretty slick!
great and useful new info!!