Include a list (as links, or embeds) of your most recent X videos from a YouTube channel:

<?php
// change <YourChannelName> and <X>
$url = 'http://gdata.youtube.com/feeds/api/users/<YourChannelName>/uploads?orderby=updated&max-results=<X>';
$xml = simplexml_load_file($url);
foreach ($xml->entry as $entry) :

	// get nodes using mrss ('media' rss namespace)
	$kids = $entry->children('http://search.yahoo.com/mrss/');

	// for the embed src (just the flv location - you'll need to print out the rest of the object/embed tag
	$attributes = $kids->group->content[0]->attributes();
	$flv = $attributes['url'];

	// or for the youtube page showing that video, appropriate for populating the href attribute of links
	$attributes = $kids->group->player->attributes();
	$link = $attributes['url']; 

?>

<a href="<?=$link?>"...
<!-- or -->
<object...
	<param name="movie" value="<?=$flv?>" />

<?php endforeach; ?>