Custom annotation module

hi

Has anyone read the book: 'Pro Drupal Development'? Well, anyways, I'm trying to get a custom module to work, only I'm having difficulty.
The module is supposed to let users make an annotation (a type of note that only the user can see) to a web page.

My files:

<?php

/var/www/drupal-6.16/sites/all/modules/custom/annotate/annotate.module
// $Id$

/**
 * @file
 * Lets users add private annotations to nodes.
 *
 * Adds a text field when a node is displayed
 * so that authenticated users may make notes.
 */
 
 /**
  * Implementation of hook_menu().
  */
 
 function annotate_menu() {
    $items['admin/settings/annotate'] = array(
        'title'             =>  'Annotation settings',
        'description'       =>  'Change how annotations behave.',    
        'page callback'     =>  'drupal_get_form',
        'page arguments'    =>  array('annotate_admin_settings'),
        'access arguments'  =>  array('adminsiter site configuration'),
        'type'              =>  MENU_NORMAL_ITEM,
        'file'              =>  'annotate.admin.inc'
    );
 
 return $items;
 }
 
  /**
  * Implementation of hook_nodeapi().
  */
 
 function annotate_nodeapi(&$node, $op, $teaser, $page) {
 
    global $user;
    switch ($op) {
        // The 'view' operation means the node is about to be displayed.
        case 'view':
            // Abort if the user is an anonymous user (not logged in) or
            // if the node is not being displayed on a page by itself
            // (for example, it could be in a node listing or search result).
            
            if($user->id == 0 || !$page) {
                break;
            }
        // Find out which node types we should annotate.
        $types_to_annotate = variable_get('annotate_node_types', array('page'));
        
    // Abort if this node is not one of the types we should annotate.
    if(!in_array($node->type, $types_to_annotate)) {
        break;
    }
 
    // Add our form as a content item.
    $node->content['annotation_form'] = array(
        '#value'    =>  drupal_get_form('annotate_entry_form', $node),
        '#weight'   =>  10  
    );   
    break;
   }
 }
   
  /**
  * Define the form for entering an annotation.
  */
   
 function annotate_entry_form($form_state, $node) {
 
    // Define a fieldset.
    $form['annotate'] = array(
        '#type'     =>  'fieldset',
        '#title'    =>  t('Annotations')
    );
 
    // Define a textarea inside the fieldset.
    $form['annotate']['note'] = array(
        '#type'             =>  'textarea',
        '#title'            =>  t('Notes'),
        '#default_value'    =>  isset($node->annotation) ? $node->annotation : '',
        '#description'      =>  t('Make your personal annotations about this content here.
            Only you (and the site administrator) will be able to see them.')
    );
    
    // For convenience, save the node ID.
    $form['annotate']['nid'] = array(
        '#type'     =>  'value',
        '#value'    =>  $node->nid,
    );
    
    // Define a submit function.
    $form['annotate']['submit'] = array(
        '#type'     =>  'submit',
        '#value'    =>  t('Update'),
    );
    return $form;     
 }
 

<?php
/var/www/drupal-6.16/sites/all/modules/custom/annotate/annotate.admin.inc


// $Id$

/**
 * @file
 * Administration page callbacks for the annotate module.
 */
 
/**
 * Form builder. Configure annotations.
 *
 * @ingroup forms
 * @see system_settings_form().
 */ 
 
 function annotate_admin_settings() {
    // Get an array of node types with internal names as keys and
    // "friendly names" as values. E.g.,
    //array('page' => 'Page', 'story' => 'Story')
    
    $options = node_get_types('names');
    
    $form['annotate_node_types'] = array(
        '#type'             =>  'checkboxes',
        '#title'            =>  t('Users may annotate these content types'),
        '#options'          =>  $options,
        '#default_value'    =>  variable_get('annotate_node_types', array('page')),
        '#description'      =>  t('A text field will be available on these content types to
                  make user-specific notes.')
    );
    
    return system_settings_form($form);
  
 
 } 
 

and

/var/www/drupal-6.16/sites/all/modules/custom/annotate/annotate.info

; $Id$
name = Annotate
description = Allows users to annotate nodes.
core = 6.x
package = Pro Drupal Development

The book goes on to read:

Create and view a Page node in your web browser, and you should see that the form has been appended with the annotations form.

Only, I can't see the form?

Ive enabled the annotate module and navigating to Adminsiter > Site Configuration > Annotate; successfully shows me that the configuration form for annotate.module is working correctly.

Ive pretty much followed the book to the letter, and I'm not sure what the problem is now?

help please..:)