This tool will help you create a template for your own Wordpress plugin. It will provide sample code for the insertion of HTML in your blog, and the configuration page in the admin interface.
PHP template code
<?php
/*
Plugin Name: myplugin
Plugin Script: myplugin.php
Plugin URI: http://.../myplugin (where should people go for this plugin?)
Description: (...)
Version: 0.1
Author: Your name
Author URI: http://... (your blog/site URL)
Template by: http://web.forret.com/tools/wp-plugin.asp
=== RELEASE NOTES ===
2010-02-09 - v1.0 - first version
*/
// uncomment next line if you need functions in external PHP script;
// include_once(dirname(__FILE__).'/some-library-in-same-folder.php');
?>