I did a forum and trac search and it seems no one made one now so I made one that is based on Tris' latest comments function from the zenphoto admin.php.
Place the file as rss-comments-php within the zenphoto root directory. The link for the theme files then is simplye "rss-comments.php".
Here is the code:
`
<?php
header('Content-Type: application/xml');
require_once("zen/template-functions.php");
$themepath = 'themes';
require_once("zen/zp-config.php");
?>
<rss version="2.0">
<channel>
<title><?php echo $conf['gallery_title']." - latest comments"; ?></title>
<link><?php echo "http://".$_SERVER["HTTP_HOST"].WEBPATH; ?></link>
<description><?php echo $conf['gallery_title']; ?></description>
<language>en-us</language>
<pubDate><?php echo date("r", time()); ?></pubDate>
<lastBuildDate><?php echo date("r", time()); ?></lastBuildDate>
<docs>http://blogs.law.harvard.edu/tech/rss</docs>
<generator>Acrylian's ZenPhoto Comment RSS Generator based on Tris's Latest Comments function from zenphoto admin.php</generator>
<managingEditor><?php echo $conf['admin_email']; ?></managingEditor>
<webMaster><?php echo $conf['admin_email']; ?></webMaster>
<?php
mysql_connect($conf['mysql_host'],$conf['mysql_user'],$conf['mysql_pass']);
mysql_select_db($conf['mysql_database']) or die( "Unable to select database");
$comments = query_full_array("SELECT c.id, i.title, i.filename, a.folder, a.title AS albumtitle, c.name, c.website," . " c.date, c.comment FROM ".prefix('comments')." AS c, ".prefix('images')." AS i, ".prefix('albums')." AS a " . " WHERE c.imageid = i.id AND i.albumid = a.id ORDER BY c.id DESC LIMIT 10");
foreach ($comments as $comment)
{
$author = $comment['name'];
$album = $comment['folder'];
$image = $comment['filename'];
$albumtitle = $comment['albumtitle'];
if ($comment['title'] == "") $title = $image; else $title = $comment['title'];
$website = $comment['website'];
$comment = truncate_string($comment['comment'], 123);
?>
<item>
<title><?php echo $albumtitle.": ".$title." by ".$author; ?></title>
<link><?php echo '<![CDATA[http://'.$_SERVER['HTTP_HOST'].WEBPATH.'/index.php?album='.$album.'&image='.$image.']]>';?></link>
<dc:creator><?php echo $author; ?></dc:creator>
<description><?php echo $comment; ?></description>
<guid><?php echo '<![CDATA[http://'.$_SERVER['HTTP_HOST'].WEBPATH.'/index.php?album='.$album.'&image='.$image.']]>';?></guid>
</item>
<?php } ?>
</channel>
</rss>
`