Add a Separator to the Admin Menu via http://wordpress.stackexchange.com/questions/2666/add-a-separator-to-the-admin-menu

functions

function add_admin_menu_separator($position) {
    global $menu;
    $index = 0;
    foreach($menu as $offset => $section) {
    if (substr($section[2],0,9)=='separator')
        $index++;
        if ($offset>=$position) {
            $menu[$position] = array('','read',"separator{$index}",'','wp-menu-separator');
            break;
        }
    }
    ksort( $menu );
}

// example implementation
add_action('admin_init','admin_menu_separator');
function admin_menu_separator() {
    add_admin_menu_separator(26);
    add_admin_menu_separator(29);
}