diff -ruN moodle-1.7/blocks/course_list/block_course_list.php moodle-dev/blocks/course_list/block_course_list.php
--- moodle-1.7/blocks/course_list/block_course_list.php	2006-09-29 03:00:48.000000000 +0100
+++ moodle-dev/blocks/course_list/block_course_list.php	2006-10-02 20:06:29.000000000 +0100
@@ -19,11 +19,24 @@
             return $this->content;
         }
 
+       $hiddentoguests = false;
+
+       if (isset($CFG->block_course_list_hiddentoguests) ){
+         if ( $CFG->block_course_list_hiddentoguests == '1' ){
+           $hiddentoguests = true;
+         }
+       }
+
         $this->content = new stdClass;
         $this->content->items = array();
         $this->content->icons = array();
         $this->content->footer = '';
 
+	// hide courses to those not loogged in
+	if ( $hiddentoguests && ( !isset($USER->id) || isguest() ) ){
+	  return $this->content;
+	}
+
         $icon  = "<img src=\"$CFG->pixpath/i/course.gif\"".
                  " height=\"16\" width=\"16\" alt=\"".get_string("course")."\" />";
        
diff -ruN moodle-1.7/blocks/course_list/config_global.html moodle-dev/blocks/course_list/config_global.html
--- moodle-1.7/blocks/course_list/config_global.html	2005-02-08 18:32:59.000000000 +0000
+++ moodle-dev/blocks/course_list/config_global.html	2006-10-02 20:12:24.000000000 +0100
@@ -4,14 +4,21 @@
     <td>
     <input name="block" type="hidden" value="<?php echo intval($_REQUEST['block']); ?>" />
     <select name="block_course_list_adminview">
-     <option value="all" <?php if(isset($CFG->block_course_list_adminview)){ 
-     if($CFG->block_course_list_adminview == "all"){ p("selected");}
+      <option value="all" <?php 
+      
+      if(isset($CFG->block_course_list_adminview)){ 
+	if($CFG->block_course_list_adminview == "all"){ 
+	  p("selected");
+	}
      }else{
         p("selected");
      }?>     
      ><?php p(get_string('allcourses', 'block_course_list')) ?></option>
-     <option value="own" <?php if(isset($CFG->block_course_list_adminview)){ 
-     if($CFG->block_course_list_adminview == "own"){ p("selected"); }
+     <option value="own" <?php 
+     if(isset($CFG->block_course_list_adminview)){ 
+	if($CFG->block_course_list_adminview == "own"){ 
+	  p("selected");
+	}
      }?>
      ><?php p(get_string('owncourses', 'block_course_list')) ?></option>
     </select>
@@ -20,6 +27,33 @@
     <?php print_string("configadminview", "block_course_list") ?>
     </td>
 </tr>
+<tr valign="top">
+    <td align="right">block_course_list_hiddentoguests:</td>
+    <td>
+    <input name="block" type="hidden" value="<?php echo intval($_REQUEST['block']); ?>" />
+    <select name="block_course_list_hiddentoguests">
+      <option value="0" <?php 
+     if(isset($CFG->block_course_list_hiddentoguests)){ 
+	if($CFG->block_course_list_adminview == '0' ){ 
+	  p("selected");
+	}
+     }else{
+        p("selected");
+     }?>     
+     ><?php p(get_string('visibletoguests', 'block_course_list')) ?></option>
+     <option value="1" <?php 
+     if(isset($CFG->block_course_list_hiddentoguests)){ 
+	if($CFG->block_course_list_hiddentoguests== "1"){ 
+	  p("selected"); 
+	}
+     }?>
+     ><?php p(get_string('hiddentoguests', 'block_course_list')) ?></option>
+    </select>
+    </td>
+    <td>
+    <?php print_string("hiddentoguests_explanation", "block_course_list") ?>
+    </td>
+</tr>
 <tr>
     <td colspan="3" align="center">
     <input type="submit" value="<?php print_string("savechanges") ?>" /></td>
diff -ruN moodle-1.7/lang/en_utf8/block_course_list.php moodle-dev/lang/en_utf8/block_course_list.php
--- moodle-1.7/lang/en_utf8/block_course_list.php	2006-02-06 09:28:54.000000000 +0000
+++ moodle-dev/lang/en_utf8/block_course_list.php	2006-10-02 19:58:20.000000000 +0100
@@ -4,5 +4,8 @@
 $string['allcourses'] = 'Admin user sees all courses';
 $string['configadminview'] = 'What should the admin see in the course list block?';
 $string['owncourses'] = 'Admin user sees own courses';
+$string['hiddentoguests_explanation'] = 'Should guests be able to see the course list block?';
+$string['visibletoguests'] = 'Block is visible to guests';
+$string['hiddentoguests'] = 'Block is hidden to guests';
 
 ?>