post an opml file as an unordered list in a wordpress post or page. just use the shortcode [opml url="OPML_URL"] in the content area. This is based on a php script by Betsy Kimak http://www.umaitech.com/cms/?p=311

opml in wordpress

<?php
/*
Plugin Name: OPML in WordPress
Author: Jeffrey Kishner
*/

function fargo2opml ($opmlfile) {

$opmfile = shortcode_atts(array(
'url' => '',
), $opmlfile);


function parse_opml($xml,$depth=1) {
  if (count($xml->children()) > 0) {
  echo'<ul>';
 }
foreach ($xml->children() as $child) {
if ($child['url']) {
echo '<li><a href='.$child['url'].'>'.$child['text'].'</a></li>';
}
else {
echo '<li>'.$child['text'].'</li>'; // level 1 outlines
}
  parse_opml($child,$depth+1); // nested outlines
 }
  if (count($xml->children()) > 0) {
  echo '</ul>';
 }
}
$file = new SimpleXMLElement($opmlfile['url'],null,true);
echo '<h4>' . $file->head->title . '</h4>';
parse_opml($file->body);
}

add_shortcode('opml', 'fargo2opml');
?>