Print list of attached taxonomy terms on search result items
You almost have it.  How I'd do it is like this.  First, in (I assume you are doing this already) hook_preprocess_search_results:

function YOURMODULE_preprocess_search_results(&amp;$variables) {

  // the vid you are restricting your results to...
  // it is really up to you to define the logic of how
  // to determine this, but you could use a variable...
  $vid=variable_get('YOURMODULE_search_result_vid', 4); 

  $taxonomy=$variables['result']['node']-&gt;taxonomy;

  if ($taxonomy) {

    $terms=array();
    foreach($taxonomy as $t) {
      if ($t-&gt;vid == $vid) {
        $terms[]=$t-&gt;name;
      }
    }

    if ($terms) {
      $variables['terms']=implode(',', $terms);
    }

  }

}


will, assuming no typos and brain fades on my part, produce a $terms variable you can access in search-result.tpl.php.

Now, for step 2, copy the default one out of .../modules/search to your theme.  The default D6 one basically looks like this, with the large intro comments removed:

&lt;dt class="title"&gt;
  &lt;a href="&lt;?php print $url; ?&gt;"&gt;&lt;?php print $title; ?&gt;&lt;/a&gt;
&lt;/dt&gt;
&lt;dd&gt;
  &lt;?php if ($snippet) : ?&gt;
    &lt;p class="search-snippet"&gt;&lt;?php print $snippet; ?&gt;&lt;/p&gt;
  &lt;?php endif; ?&gt;
  &lt;?php if ($info) : ?&gt;
  &lt;p class="search-info"&gt;&lt;?php print $info; ?&gt;&lt;/p&gt;
  &lt;?php endif; ?&gt;
&lt;/dd&gt;


so in there, you can change it up basically like this:

&lt;dt class="title"&gt;
  &lt;a href="&lt;?php print $url; ?&gt;"&gt;&lt;?php print $title; ?&gt;&lt;/a&gt;
&lt;/dt&gt;
&lt;dd&gt;
  &lt;?php if ($snippet) : ?&gt;
    &lt;p class="search-snippet"&gt;&lt;?php print $snippet; ?&gt;&lt;/p&gt;
  &lt;?php endif; ?&gt;
  &lt;?php if ($info) : ?&gt;
  &lt;p class="search-info"&gt;&lt;?php print $info; ?&gt;&lt;/p&gt;
  &lt;?php endif; ?&gt;
  &lt;?php // THE NEW STUFF FOLLOWS... ?&gt;
  &lt;?php if ($terms): ?&gt;
    &lt;p class="search-terms"&gt;&lt;?php print $terms; ?&gt;&lt;/p&gt;
  &lt;?php endif; ?&gt;
  &lt;?php // ...END OF THE NEW STUFF ?&gt;
&lt;/dd&gt;


and with some CSS styling of your new search-terms class, be on your way.