<?php
// List links, ordered by category, A-Z
$link_cats = $wpdb->get_results("SELECT cat_id, cat_name FROM $wpdb->linkcategories ORDER BY cat_name ASC");
// List links, ordered by category, Z-A
// $link_cats = $wpdb->get_results("SELECT cat_id, cat_name FROM $wpdb->linkcategories ORDER BY cat_name DESC");
// List links, ordered by category ID, ascending
// $link_cats = $wpdb->get_results("SELECT cat_id, cat_name FROM $wpdb->linkcategories ORDER BY cat_id ASC");
// List links, ordered by category ID, descending
// $link_cats = $wpdb->get_results("SELECT cat_id, cat_name FROM $wpdb->linkcategories ORDER BY cat_id DESC");
foreach ($link_cats as $link_cat) {
?>
<h2><?php echo $link_cat->cat_name; ?></h2>
<ul>
<?php wp_get_links($link_cat->cat_id); ?>
</ul>
<?php } ?>