I’ve created some WordPress plugins which are freely available:
This plugin generates a XML-Sitemap compliant sitemap of your WordPress blog. This format is supported by Ask.com, Google, YAHOO and MSN Search.
ImageShack is a free easy-to-use hosting service which allows you to upload your images and share them with others. This plugin allows you to embed these images directly into your website and use the auto generated thumbnails.
SiteInfo is an open standard which allows you to specify information that will be displayed in a toolbar menu. This allows the A9 toolbar (or other toolbars that want to use SiteInfo) to display a menu about your site, when a user is on your site.
With this plugin you can add a “Bookmark this page on del.icio.us” link to your posts or sidebar. This will allow your visitors to add your page directly into their del.icio.us profile and makes your blog more popular!