The plugin, written in PHP, has several well-documented examples of helpful WordPress plugin features.

See how the readme.txt maps to the hosted plugin pages and the 5 hosted screenshots.

The main code module dandyid-services.php has examples of:

• Creating a sidebar widget.
• Processing returned XML that is PHP4 and PHP5 compatible.
• Storing and retrieving wp-database options in an array.
• Embedding the plugin name and version-number into a <div> tag that appears on all blog pages that render the plugin. (useful for debugging — many versions of the plugin can be out there in the wild)
• Localization for international language support.
• Creating an options page for admin plugin configuration, including HTML that renders radio buttons and checkboxes.
• Caching the DandyID API results — on a busy blog, the plugin only calls the DandyID API once every 2 hours.
• A plugin activation hook that creates initialized, defaulted wp-database options.
• A plugin deactivation hook that cleanly removes the plugin wp-database options.

Here is the WordPress maintained repository that contains all of the DandyID Services Plugin files for the current release. It is packaged as a zipfile when it is downloaded from WordPress.

The PeoplePond WordPress Plugin retrieves “about me” information from PeoplePond, and creates (or refreshes once daily) the About page on a blog.

The main code module peoplepond.php has the following examples:

• Hooks the_content() with a filter hook, causing the plugin code to be called each time any page renders. If it’s the About page, the PeoplePond API is called (only once per day max) to update the About page content.
• Uses wp_insert_post() and wp_update_post() to create and update the content of blog posts.

Here is the WordPress repository that contains all of the PeoplePond Plugin files for the current release.