A simple, multi-purpose PHP feed proxy.

feedproxy.php

<?php
    $session = curl_init($_GET['url']);
    curl_setopt($session, CURLOPT_HEADER, false);
    curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
    $xml = curl_exec($session);
    header("Content-Type: text/xml");
    echo $xml;
    curl_close($session);
?>