Custom Module basic block hooks

gistfile1.aw

<?php
/**
 * Implements hook_block_info
 */
function custom_module_block_info() {

  $blocks['custom_module_my_block'] = array(
    'info' => t('My block'),
    'cache' => DRUPAL_CACHE_PER_PAGE,
  );

  return $blocks;
}

/**
 * Implements hook_block_view
 *
 * Passes off the function call to _custom_module_view_DELTA
 */
function custom_module_block_view($delta = '') {
  // our block code...
}