Index: wp-includes/taxonomy.php
===================================================================
--- wp-includes/taxonomy.php	(revision 16268)
+++ wp-includes/taxonomy.php	(working copy)
@@ -85,7 +85,7 @@
 			'singular_name' => '',
 		),
 		'query_var' => false,
-		'rewrite' => false,
+		'rewrite' => array( 'slug' => 'format' ),
 		'show_ui' => false,
 		'_builtin' => true,
 		'show_in_nav_menus' => false,
Index: wp-includes/category-template.php
===================================================================
--- wp-includes/category-template.php	(revision 16268)
+++ wp-includes/category-template.php	(working copy)
@@ -1189,4 +1189,19 @@
 	return $r;
 }
 
-?>
+/**
+ * Returns a link to a post format index.
+ *
+ * @since 3.x.0
+ *
+ * @param $format string Post format
+ * @return string Link
+ */
+function get_post_format_link( $format ) {
+	$term = get_term( 'post-format-' . $format, 'post_format' );
+	if ( ! $term || is_wp_error( $term ) )
+		return false;
+	return get_term_link( $term );
+}
+
+?>
\ No newline at end of file