Your second parameter to register_taxonomy should be the post type you want the taxonomy to apply to, or an array of post types.
register_taxonomy('blog_tags','post',array(
'hierarchical' => false,
'labels' => $labels,
'show_ui' => true,
'show_admin_column' => true,
'update_count_callback' => '_update_post_term_count',
'query_var' => true,
'rewrite' => array( 'slug' => 'blog_tags' ),
));
Will make this taxonomy show up for the built-in post post type.
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