Here are the archived versions of my plugin, p2pConverter.

=== p2pConverter ===
Author: bbbco
Plugin URI: http://www.briandgoad.com/blog/p2pConverter
Tags: manage, edit, pages, admin, plugin, convert, posts
Requires at least: 2.2
Tested up to: 2.6

=== Description ===
Converts either a static Page into a Post, or a Post into a static Page!
Just click on the Manage tab in the Admin interface, and click the Posts or Pages sub-tab.
Within that page you will see an extra column, with a Convert! option. If you want to convert
a page or a post to the either, click that link!

=== Installation ===
Copy the ‘p2pConverter’ directory (with all of its contents) to your plugins directory and
activate the p2pConverter plugin from WordPress, and volia! You will now be able to convert!

=== Frequently Asked Questions ===
What does “managepages.php” and “JSON.php” do?

These are files required to run the plugin correctly in versions of Wordpress below 2.5
In upgraded versions of Wordpress, 2.5 and higher, these files are not required to run
as the required methods have been integrated already. Please make sure you download the
correct plugin type.

I get a php warning that says:
Warning: main(JSON.php) [function.main]: failed to open stream: No such
file or directory in [...]/wp-content/plugins/p2pconverter/managepages.php
on line 36

Fatal error: main() [function.require]: Failed opening required ‘JSON.php’
(include_path=’.:/usr/lib/php:/usr/local/lib/php’) in
[...]/wp-content/plugins/p2pconverter/managepages.php on line 36

Please make sure that the JSON.php file is included in the p2pConverter directory, and that the
file name is spelled that exact way (”JSON” in all CAPS).

[Ask a question] mailto: bdgoad (at) gmail (dot) com

=== Version History ===

== Version 0.5 ==
*Does not include Scompt’s ManagePages. Useful for WP 2.5+

  p2pConverter 0.5 (5.1 KiB, 261 hits)

== Version 0.4 ==
*Includes Scompt’s ManagePages. Requires for WP pre-2.5

  p2pConverter 0.4 (15.6 KiB, 326 hits)

== Version 0.3 ==

  p2pConverter 0.3 (15.1 KiB, 222 hits)

== Version 0.2 ==

  p2pConverter 0.2 (14.8 KiB, 228 hits)

=== Special Thanks ===
Thanks to scompt for his ManageCustomPages plugin [http://scompt.com/projects/manage-pages-custom-columns-in-wordpress]
and his tutorial on including extra columns in the posts section [http://scompt.com/archives/2007/10/20/adding-custom-columns-to-the-wordpress-manage-posts-screen]