diff -Nur NewsPortal-orig/killfile.php NewsPortal-new/killfile.php
--- NewsPortal-orig/killfile.php	1970-01-01 01:00:00.000000000 +0100
+++ NewsPortal-new/killfile.php	2004-12-12 23:19:31.000000000 +0100
@@ -0,0 +1,62 @@
+<?
+
+  // simple killfile management. 2004-12-12 Frederik Ramm <frederik@remote.org>
+  // see end of newsportal.php for a short comment on killfile functionality.
+
+  // register parameters
+  $author = "";
+  if (isset($_REQUEST["author"]))$author=urldecode($_REQUEST["author"]);
+  $remove = "";
+  if (isset($_REQUEST["remove"])) $remove=urldecode($_REQUEST["remove"]);
+  $return = "";
+  if (isset($_REQUEST["return"])) $return=urldecode($_REQUEST["return"]);
+
+  include "config.inc.php";
+  include "auth.inc";
+  include "$file_newsportal";
+  parse_killfile_cookies();
+
+  if ($author != "")
+  {
+      add_author_to_killfile($author);
+      set_killfile_cookies();
+  }
+  else if ($remove != "")
+  {
+       remove_author_from_killfile($remove);
+       set_killfile_cookies();
+  }
+
+  include "head.inc";
+?>
+
+<h1 align="center"><? echo "killfile" ?></h1>
+
+<? 
+  if (is_killfile_empty())
+  {
+      echo "Your kill file is empty.";
+  }
+  else
+  {
+      echo "Authors in your kill file:";
+      echo "<ul>";
+
+      $killauthors = get_authors_in_killfile();
+      for ($i=0; $i<count($killauthors); $i++)
+      {
+          echo "<li> ";
+          echo htmlspecialchars($killauthors[$i]);
+          echo ' <a href="killfile.php?return='.urlencode($return).'&remove='.urlencode($killauthors[$i]).'"">(remove)</a>';
+      }
+      echo "</ul>";
+  }
+
+  if ($return != "")
+  {
+      echo "<p>";
+      echo '<a href="'.$return.'">Return to article/thread view</a> (make sure to shift-reload the view to take changes into account)';
+  }
+
+  include "tail.inc";
+?>
diff -Nur NewsPortal-orig/lang/deutsch.lang NewsPortal-new/lang/deutsch.lang
--- NewsPortal-orig/lang/deutsch.lang	2004-04-03 02:34:30.000000000 +0200
+++ NewsPortal-new/lang/deutsch.lang	2004-12-13 09:22:10.000000000 +0100
@@ -58,5 +58,6 @@
 $text_error["auth_error"]="Authentifikation beim Newsserver fehlgeschlagen.";
 $text_error["spool_error"]="Fehler in Spooldatei. Bitte neuladen.";
 
+$text_kill["add_author_to_killfile"]="Zu Killfile hinzufügen";
 
 ?>
diff -Nur NewsPortal-orig/lang/english.lang NewsPortal-new/lang/english.lang
--- NewsPortal-orig/lang/english.lang	2004-04-03 02:34:30.000000000 +0200
+++ NewsPortal-new/lang/english.lang	2004-12-12 21:10:56.000000000 +0100
@@ -58,4 +58,6 @@
 $text_error["auth_error"]="Authentifikation at the Newsserver failed.";
 $text_error["spool_error"]="Error in spoolfile. Please reload.";
 
+$text_kill["add_author_to_killfile"]="Add to killfile";
+
 ?>
diff -Nur NewsPortal-orig/newsportal.php NewsPortal-new/newsportal.php
--- NewsPortal-orig/newsportal.php	2004-04-03 02:39:00.000000000 +0200
+++ NewsPortal-new/newsportal.php	2004-12-13 23:21:38.000000000 +0100
@@ -1550,6 +1550,9 @@
     $lineclass="np_thread_line".(($article_count%2)+1);
     // read the first article
     $c=$headers[$liste[$i]]; 
+
+    if (author_is_in_killfile($c->from)) continue;
+
     $article_count++; 
     // Render the graphical tree
     switch ($thread_treestyle) {
@@ -1833,7 +1836,7 @@
     // exists a cached html-output?
     $filename=$spooldir."/".$group."-".$article_first."-".
               $article_last.".html";
-    if (!file_exists($filename)) {
+    if (!(file_exists($filename) && is_killfile_empty())) {
       // no, we need to create a new html-output
       $output="";
       reset($headers);
@@ -1849,10 +1852,14 @@
         $output.=showThread($headers,$liste,1,"",$group,$article_first,
                  $article_last,$article_count);
       }
-      // cache the html-output
-      $file=fopen($filename,"w");
-      fputs($file,$output);
-      fclose($file);
+      if (is_killfile_empty())
+      {
+          // cache the html-output
+          // only if kill file is empty.
+          $file=fopen($filename,"w");
+          fputs($file,$output);
+          fclose($file);
+      }
     } else {
       // yes, a cached output exists, load it!
       $file=fopen($filename,"r");
@@ -1876,6 +1883,7 @@
 function show_header($head,$group) {
   global $article_show,$text_header,$file_article,$attachment_show;
   global $file_attachment,$anonym_address;
+  global $text_kill;
   echo '<div class="np_article_header">';
   if ($article_show["Subject"]) echo $text_header["subject"].htmlspecialchars($head->subject)."<br>";
   if ($article_show["From"]) {
@@ -1895,6 +1903,11 @@
         echo '</a>';
       if ($head->name != "") echo ' ('.htmlspecialchars($head->name).')';
     }
+    // fred +
+    echo ' -- <a href="killfile.php?return='.urlencode($_SERVER["REQUEST_URI"]).'&author='.urlencode($head->from).'">(';
+    echo $text_kill["add_author_to_killfile"];
+    echo ')</a>';
+    // fred -
     echo "<br>";
   }
   if ($article_show["Newsgroups"]) 
@@ -2281,4 +2294,142 @@
   return $message;
 }
 
-?>
\ No newline at end of file
+/* --------------
+ * Killfile extensions, 2004-12-12, Frederik Ramm <frederik@remote.org>
+ *
+ * Very crude killfile mechanism that allows users to store "From" header
+ * values in a killfile cookie and filters them from thread listings.
+ * A primitive means of editing the list is available with killfile.php.
+ * Caveat emptor! Authors on the kill list currently cut off everything
+ * that would come below in the same thread.
+ *
+ * Cookie functionality is encapsulated in these routines to make it
+ * easy to change the mechanism later.
+ *
+ * The whole killfile stuff still has to be internationalized properly.
+ *
+ * A few words about the "user experience": 
+ * Following the "From:" header in an article listing, a hyperlink is
+ * displayed that adds this author to the kill file.
+ * Additionally, every thread view has a hyperlink at the top for
+ * branching to the kill file view (unless the user does not have a
+ * kill file defined).
+ */
+
+/*
+ * parses the kill cookie and reads its contents into a global variable.
+ * has to be called by all scripts that need killfile functionality.
+ */
+function parse_killfile_cookies() {
+    global $killfile;
+    global $HTTP_COOKIE_VARS;
+    if (isset($HTTP_COOKIE_VARS["npkill"])) {
+        $zip = base64_decode($HTTP_COOKIE_VARS["npkill"]);
+        $version = substr($zip,0,1);
+
+        // the following makes a version distinction based on the
+        // first character of the cookie. the idea is that later
+        // versions of this software with increased killfile 
+        // capabilites will have the need to encapsulate more 
+        // information in that cookie, requiring a different
+        // and incompatible structure. old-style cookies still
+        // stored on the user machine would then either be lost
+        // or, worse, trigger a php error. the version code will
+        // enable us to make an informed decision on how to 
+        // process (or disregard) the cookie.
+
+        if ($version == "a") {
+            // "version a" cookie
+            parse_killfile_cookies_version_a(substr($zip, 1));
+        }
+        else
+        {
+            // unknown version
+            $killfile=array();
+        }
+    }
+    else
+    {
+        $killfile=array();
+    }
+    sort($killfile);
+}
+
+/*
+ * helper for parse_killfile_cookies. decodes a "version a" cookie.
+ * a "version a" cookie consists of a leading "Z", followed by a 
+ * gz-deflated version of a serialized array.
+ */
+function parse_killfile_cookies_version_a($cookieval) {
+    global $killfile;
+    // remove leading "Z" marker and version code
+    $ser = gzinflate(substr($cookieval, 1));
+    $killfile = unserialize($ser);
+}
+
+/*
+ * adds someone to the internal kill file list.
+ */
+function add_author_to_killfile($author) {
+    global $killfile;
+    if (!author_is_in_killfile($author)) {
+        $killfile[] = $author;
+        sort($killfile);
+    }
+}
+
+/*
+ * produces a cookie from the internal kill file list. must be
+ * called before output is started.
+ * The internal array is serialized, zipped, and base-64 encoded.
+ * TODO: zip only if size is actually reduced.
+ * this implementation writes a "version a" cookie.
+ */
+function set_killfile_cookies() {
+    global $killfile;
+    $ser = serialize($killfile);
+    $zip = "Z".gzdeflate($ser); // add "Z" marker for later use
+    $b64 = base64_encode("a".$zip); // add "a" marker for "version a"
+    setcookie("npkill", $b64);
+}
+
+/*
+ * returns an array with all the authors in the kill file.
+ */
+function get_authors_in_killfile() {
+    global $killfile;
+    return $killfile;
+}
+
+/*
+ * checks whether a certian author is in the kill file.
+ */
+function author_is_in_killfile($author) {
+    global $killfile;
+    return is_array($killfile) && in_array($author, $killfile);
+}
+
+/*
+ * removes an author from the internal kill file by copying only
+ * the not-removed entries.
+ */
+function remove_author_from_killfile($author) {
+    global $killfile;
+    $newkillfile = array();
+    for ($src = 0; $src<count($killfile); $src++)
+    {
+        if ($killfile[$src] != $author) $newkillfile[]=$killfile[$src];
+    }
+    $killfile = $newkillfile;
+}
+
+/*
+ * returns true if the kill file is empty.
+ */
+function is_killfile_empty()
+{
+    global $killfile;
+    return ((!is_array($killfile)) || (count($killfile)==0));
+}
+
+?>
diff -Nur NewsPortal-orig/thread.php NewsPortal-new/thread.php
--- NewsPortal-orig/thread.php	2004-04-03 02:34:30.000000000 +0200
+++ NewsPortal-new/thread.php	2004-12-12 23:06:09.000000000 +0100
@@ -18,14 +18,21 @@
 <h1 align="center"><?php echo $group; ?></h1></a>
 
 <?
+include("$file_newsportal");
+parse_killfile_cookies();
 
 echo '<p align="center">';
 if (!$readonly) 
   echo '[<a href="'.$file_post.'?newsgroups='.urlencode($group).'&amp;type=new">'.$text_thread["button_write"]."</a>] ";
-echo '[<a href="'.$file_index.'">'.$text_thread["button_grouplist"].'</a>]';
+echo '[<a href="'.$file_index.'">'.$text_thread["button_grouplist"].'</a>] ';
+if (!is_killfile_empty())
+{
+    $return = urlencode($_SERVER["REQUEST_URI"]);
+    echo '[<a href="killfile.php?return='.$return.'">You have set up a kill file. Click here to edit it.</a>]';
+}
 echo '</p>';
 
-include("$file_newsportal");
+
 $ns=nntp_open($server,$port);
 flush();
 if ($ns != false) {