Looking for a simple module

Thank you for your quick response...

I added the menu call back for quick testing .. by clicking on the menu, rather than modifying the URL.. :)

What I have done is saved a sample module that I found on the net and trying to decipher it, and then modify it to what I need...

The module that i had downloaded was extracting the information for nodes that were created during a specific period, and displaying it.. pretty simple huh? This was not working.. so that is when I started modifying the code to track down the problem..

With the help that you provided, I added the $op... the module works when I have if ($op == 'view') { add stuff to block }.. Because, the $op's value is not 'view'.. it is ''. The module follows:

I added 'My Module's Data' to Primary Links and 'My Module Settings' to Administer

function mymodule_menu() {

$items = array();

$items[] = array(
'path' => 'admin/settings/mymodule',
'title' => t('My Module settings'),
'description' => t('Description of My Module settings control'),
'callback' => 'drupal_get_form',
'callback arguments' => 'mymodule_admin',
'access' => user_access('access administration pages'),
'type' => MENU_NORMAL_ITEM,
);

$items[] = array(
'path' => 'admin/settings/mymodule_block',
'title' => t("My Module's Data"),
'description' => t('View Data'),
'callback' => 'drupal_get_form',
'callback arguments' => 'mymodule_block',
'access' => user_access('access mymodule content'),
'type' => MENU_NORMAL_ITEM,
);


return $items;
}

/**
* Display help and module information
* @param section which section of the site we're displaying help 
* @return help text for section
*/
function mymodule_help($section='') {

  $output = '';

  switch ($section) {
    case "admin/help#mymodule":
      $output = '<p>'.  t("Displays links to nodes created"). '</p>';
      break;
  }

  return $output;
} // function mymodule_help

/**
* Valid permissions for this module
* @return array An array of valid permissions for the mymodule module
*/
function mymodule_perm() {

return array('access mymodule content', 'administer mymodule');

} // function mymodule_perm



function newmodule_perm() {

return array('access newmodule', 'create newmodule', 'administer newmodule');

} // function newmodule_perm


/**
* Generate HTML for the mymodule block
* @param op the operation from the URL
* @param delta offset
* @returns block HTML 
*/

function mymodule_block($op='list', $delta=0) {

$block = array();

 if ($op == 'view') {
     $block = array ('subject' => t('My Module Data'), 'content' => 'Hello');
 }
 return $block;
}


function mymodule_admin() {

$form['mymodule_maxdisp'] = array(
'#type' => 'textfield',
'#title' => t('Maximum number of links'),
'#default_value' => variable_get('mymodule_maxdisp', 3),
'#size' => 2,
'#maxlength' => 2,
'#description' => t("The maximum number of links to display in the block.")
);

return system_settings_form($form);
}