How can I merge this function(s) that inserts terms to a custom taxonomy with this other that adds a custom taxonomy filter?

So, you want this?

_{(source: mikeschinkel.com)}

Alright, here ya go:

<?php 
/*
Plugin name: Static Content
*/
if (!class_exists('YourSite_StaticContent')) {
 class YourSite_StaticContent {
   static function on_load() {
     add_action('init',array(__CLASS__,'init'));
     add_filter('manage_static_content_posts_columns',
         array(__CLASS__,'manage_static_content_posts_columns'));
     add_filter('manage_posts_custom_column',
         array(__CLASS__,'manage_posts_custom_column'),10,2);
     add_action('restrict_manage_posts',
         array(__CLASS__,'restrict_manage_posts'));
     add_filter('parse_query',
         array(__CLASS__,'parse_query'));
   }
   static function init() {
     register_post_type('static_content',array(
       'labels' => array(
         'name' => __( 'Static Content' ),
         'singular_name' => __( 'Static Content' ),
         'add_new_item' => 'Add New Static Content',
         'edit_item' => 'Edit Static Content',
         'new_item' => 'New Static Content',
         'search_items' => 'Search Static Content',
         'not_found' => 'No Static Content found',
         'not_found_in_trash' => 'No Static Content found in trash',
       ),
       'public' => true,
       'hierarchical' => false,
       'taxonomies' => array( 'section'),
       'supports' => array('title','editor','excerpt'),
       'rewrite' => array('slug'=>'static_content','with_front'=>false),
     ));
     register_taxonomy('section','static_content',array(
       'hierarchical' => true,
       'labels' => array(
         'name' => __( 'Section' ),
         'singular_name' => __( 'Section' ),
         'add_new_item' => 'Add New Section',
         'edit_item' => 'Edit Section',
         'new_item' => 'New Section',
         'search_items' => 'Search Section',
         'not_found' => 'No Sections found',
         'not_found_in_trash' => 'No Sections found in trash',
         'all_items' => __( 'All Sections' ),
       ),
       'query_var' => true,
       'rewrite' => array( 'slug' => 'section' ),
       ));
     if (!get_option('yoursite-static-content-initialized')) {
       $terms = array(
         'Footer',
         'Header',
         'Front Page Intro',
         'Front Page Content',
         );
       foreach($terms as $term) {
         if (!get_term_by('name',$term,'section')) {
           wp_insert_term($term, 'section');
         }
       }
       update_option('yoursite-static-content-initialized',true);
     }
   }
   function manage_static_content_posts_columns($columns){
     $new = array();
     foreach($columns as $key => $title) {
       if ($key=='author') // Put the Sections column before the Author column
         $new['sections'] = 'Sections';
       $new[$key] = $title;
     }
     return $new;
   }
   function manage_posts_custom_column( $column,$post_id ) {
     global $typenow;
     if ($typenow=='static_content') {
       $taxonomy = 'section';
       switch ($column) {
       case 'sections':
         $sections = get_the_terms($post_id,$taxonomy);
         if (is_array($sections)) {
           foreach($sections as $key => $section) {
             $edit_link = get_term_link($section,$taxonomy);
             $sections[$key] = '<a href="'.$edit_link.'">' . $section->name . '</a>';
           }
           echo implode(' | ',$sections);
         }
         break;
       }
     }
   }
   function parse_query($query) {
     global $pagenow;
     $qv = &$query->query_vars;
     if ($pagenow=='edit.php' &&
         isset($qv['taxonomy']) && $qv['taxonomy']=='section' &&
         isset($qv['term']) && is_numeric($qv['term'])) {
       $term = get_term_by('id',$qv['term'],'section');
       $qv['term'] = $term->slug;
     }
   }
   function restrict_manage_posts() {
     global $typenow;
     global $wp_query;
     if ($typenow=='static_content') {
       $taxonomy = 'section';
       $section = get_taxonomy($taxonomy);
       wp_dropdown_categories(array(
         'show_option_all' =>  __("Show All {$section->label}"),
         'taxonomy'        =>  $taxonomy,
         'name'            =>  $taxonomy,
         'orderby'         =>  'name',
         'selected'        =>  $wp_query->query['term'],
         'hierarchical'    =>  true,
         'depth'           =>  3,
         'show_count'      =>  true,  // This will give a view
         'hide_empty'      =>  true,   // This will give false positives, i.e. one's not empty related to the other terms. TODO: Fix that
       ));
     }
   }
 }
 YourSite_StaticContent::on_load();
}