How to change contents of a dashboard help tab

Simply paste the code below into your functions.php file.

 //hook loading of new page and edit page screens 
add_action('load-page-new.php','add_custom_help_page'); 
add_action('load-page.php','add_custom_help_page');  
function add_custom_help_page() {    
//the contextual help filter    
add_filter('contextual_help','custom_page_help'); }  
function custom_page_help($help) {    
//keep the existing help copy    
echo $help;    //add some new copy    
echo "<h5>Custom Features</h5>";   
echo "<p>Content placed above the more divider will appear in column 1. Content placed below the divider will appear in column 2.</p>"; }

Thanks to WP Tuts for the tip!