http://archive.extralogical.net/2007/06/wphooks/
http://www.nathanrice.net/blog/an-introduction-to-wordpress-action-hooks/
http://www.nathanrice.net/blog/wordpress-2-8-and-the-body_class-function/
http://themeshaper.com/2009/05/25/action-hooks-wordpress-child-themes/
http://www.stevesouders.com/blog/2009/04/09/dont-use-import/
http://wp.smashingmagazine.com/2011/10/07/definitive-guide-wordpress-hooks/
http://wp.smashingmagazine.com/2009/02/02/mastering-wordpress-shortcodes/