After looking to get open flash charts version 2 working for quite a while here are working directions.

http://drupal.org/node/423046#comment-3362858

Then in the node the directions on this page above were in fact wrong for testing the installation.

use this instead as I posted on this nodes page above.

<?php
//just the out of the box example
print open_flash_chart_api_render();

//now I'll try my own small variation, you can make your own graph with the code below:

  // create new chart object
  $chart = ofc_api_chart();

  // set chart title
  $title = "Open Flash Chart 2 API\nSample Chart";
  if ( !is_null($callback_params) ) {

    $title .= "\nARG1=" . $callback_params[1];
  }
  $chart->set('title', array(
    'text' => $title,
    'style' => '{font-size: 12px; font-family: Verdana, Arial, sans-serif; text-align: center;}',
  ));

  // create new bar_sketch element and set its attributes
  $bar = ofc_api_element('bar_sketch');
  $bar->set('colour', '#81ac00');
  $bar->set('outline-colour', '#567300');
  $bar->set('offset', 7);
  $bar->set('values', array(5, 1, 4, 3, 2, 26));
  $bar->set('tip', 'Value: #val#');

  // add bar_sketch element to the chart
  $chart->add('element', $bar);

 

print open_flash_chart_api_render($chart);
?>

http://www.drupalcoder.com/story/718-how-to-define-page-callbacks-that-d...

I haven't tried it yet, but this was a good post on Drupal Planet. I haven't needed to do this yet, but I know I will :)

/**
 * Implementation of hook_menu().
 */
function my_module_menu() {
  $items['hello'] = array(
    'title' => 'Hello world',
    'page callback' => 'my_module_page',
    'access callback' => TRUE,
  );
}

function my_module_page() {
  return t('Hello world');
  return null;
}

http://drupal.org/writing-secure-code

Just a link for a refresher on making sure you're writing secure code.

<?php

// $Id$

/**
 * A module to create a basic block to be available from the drupal blocks menu page
 *
 *
 *
 * 
 */




function latest_block($op='list',$delta=array(),$edit=array())
{
      switch ($op)
     {

        case 'list':
                       $blocks[0]['info'] = t('Latest CTL Content');
                       return $blocks;
                       break;
         case 'view':
   

          $content = 'hello world';
          $blocks['subject'] = t('Latest CTL Content');
          $blocks['content'] = $content;
       return $blocks;
       break;
      }
}

Replace the corresponding function above with whats below to get recent posts in your drupal block

function latest_block($op='list',$delta=array(),$edit=array())
{
      switch ($op)
     {

        case 'list':
                       $blocks[0]['info'] = t('Latest CTL Content');
                       return $blocks;
                       break;
         case 'view':
           ob_start();
         $num_nodes = 5;

$result = db_query_range(db_rewrite_sql('SELECT n.nid, n.title, n.type FROM {node} n WHERE n.status = 1 AND n.type <> "forum" ORDER BY n.changed DESC'), 0, $num_nodes); 

$output = node_title_list($result);
$output .= l('More...', 'tracker');
          //$content = 'hello world';
          $content = $output;
          $blocks['subject'] = t('Latest CTL Content');
          $blocks['content'] = $content;
       return $blocks;
       break;
      }
}

And here is an example with multiple blocks in the same module:

function latest_block($op='list',$delta=array(),$edit=array())
{
      switch ($op)
     {

        case 'list':
                       $blocks[0]['info'] = t('Latest CTL Content Block');
                       $blocks[1]['info'] = t('Partner Block');
                       return $blocks;
                       break;
         case 'view':
           switch ($delta) {
           case 0:
              //ob_start();
              $num_nodes = 2;

              $result = db_query_range(db_rewrite_sql('SELECT n.nid, n.title, n.type FROM {node} n WHERE n.status = 1 AND n.type = "Biography" ORDER B
Y n.changed DESC'), 0, $num_nodes);
              $result2 = db_query_range(db_rewrite_sql('SELECT n.nid, n.title, n.type FROM {node} n WHERE n.status = 1 AND n.type = "page" ORDER BY n.
changed DESC'), 0, $num_nodes);
              $result3 = db_query_range(db_rewrite_sql('SELECT n.nid, n.title, n.type FROM {node} n WHERE n.status = 1 AND n.type = "news" ORDER BY n.
changed DESC'), 0, $num_nodes);
 
              $output = node_title_list($result);
              $output .= node_title_list($result2);
              $output .= node_title_list($result3);
//$output .= l('More...', 'tracker');
              //$content = 'hello world';
              $content = $output;
              $blocks['subject'] = t('Latest CTL Content');
              $blocks['content'] = $content;
              //return $blocks;
              break;
           case 1:
              $blocks['subject']=t('Parnter Block');
              $blocks['content']="put the link to the content here";
              break;

         }
         return $blocks;


}
}

also check out http://drupal.org/node/60528

http://drupal.org/node/310075

took me forever to find this.