How to list all images attached to a node?

Basically you can use the following simple code snippet:

foreach ($node->field_image_field as $image){
  print $image['<variable>'];
}

where image_field is the name of your imagefield and where <variable> can be one of the following values:

['fid'] --> File ID
['title'] --> Image title
['alt'] --> Image alternate text
['nid'] --> Node ID
['filename'] --> File name
['filepath'] --> Filepath (relative to root)
['filemime'] --> Image mime header
['filesize'] --> File size
['view'] --> HTML code to show image

To get the file's paths and node ID you could use the following, I think:

<ul>
<?php foreach ($field_image as $image): ?>
  <li>Path: <?php print $image['filepath']; ?> // Node: <?php print $image['nid']; ?></li>
<?php endif; ?>
</ul>

there is a really cool theme('imagefield', $image) or theme('imagecache_image') function you can use in there somewhere.. up to you to figure out where it goes...