One of the first tools he has published is called Fun With Plugins. The tool acts like a plugin wizard, and after you answer several questions, the tool generates a downloadable plugin file.
One of the things I like about this tool compared to similar ones is the automatic namespacing, and support for some of the more advanced things plugin authors take advantage of including localization and admin menus. Future versions promise Ajax support, style support, client side scripting, and an automatically generated WP Extend readme file.
Be sure to check out the tool and let Andrew know how he can make it even better.