Seriously Simple Podcasting: Use categories of Wordpress

functions.php

// Podcast to wp-category
add_action( 'init', 'ssp_add_categories_to_podcast' ); 
   function ssp_add_categories_to_podcast () { 
      register_taxonomy_for_object_type( 'category', 'podcast' ); 
}

add_action( 'pre_get_posts', 'ssp_add_podcast_to_category_archives' ); 
   function ssp_add_podcast_to_category_archives( $query ){ 

   if( is_admin() ) { 
      return; 
   } 

   if( $query->is_tax('category') ) { 
      $query->set('post_type', array( 'post', 'podcast' ) ); 
   } 

}