I have noticed few inconsistencies in the WordPress 2.6.1 code regarding the methods to add content boxes to the WordPress Write Post panel. The old way included usingadd_action('dbx_post_advanced', 'myplugin_old_custom_box' ); add_action('dbx_post_sidebar', 'myplugin_old_custom_box' );which would add a box to the Advanced section and Sidebar. However since version 2.5 dbx_post_sidebar actually adds a box to the end of Advanced section not the sidebar.