StumbleUpon Favorites is a widget based on the default RSS widget that was developed to allow the sharing of bookmarks with blog visitors. This plugin makes it much easier to use and customize the list grabbed from your own StumbleUpon account.
PICS (Picture Increment Cron System) is a WordPress Plugin designed to allow you to automatically post pictures to your WordPress blog at a administrator determined timed interval.
“Wall” widget that appears in your blog’s side bar. Readers can add a quick comment about the blog as a whole, and the comment will appear in the sidebar immediately (without reloading the page).
This plugin shows a number of ‘recent posts’ for each link in your Blogroll using Ajax. When the user hover above the link the rss feed from the site is automatically detected and a number of recent posts is shown dynamically in a box.
WordPreciousss extends the theme functionality in WordPress and actually creates a theme framework on your site – having a global set of templates, so all themes can basicly be CSS only if you like. WordPreciousss also gives you the opportunity to add template files to Child Themes, so you’re not limited to using only style.css and functions.php.