Feed Wrangler is a simple plugin that allows one to create custom feeds for their WordPress blog. You can customize the structure of that feed by creating a corresponding file in your blog theme, otherwise the custom feed will default to your RSS2 feed.
Gengo is a full featured plugin that provides multi-language blogging for WordPress. It allows for an unlimited number of translations and summaries for any post and provides template tags to display language information.
The Donations Cloud plugin allows visitors to donate and leave a link with a link text. As soon as a donation is done, the blog is notified by PayPal, and the links will automatically appear on the receiver’s website (at a designated position)
Twitter Blaster is a plugin that will allow your visitors to post to your Twitter account.
The Branded Admin Plugin plugin allows for the application of custom header and footer graphics to the WordPress Admin Section. It also removes WordPress links to better distinguish the site as a custom work and reinforce the sites branding.
ImmerStat gets rid of the WordPress.com Stats widget from the Dashboard and replaces it with an ever-present .PNG in the top-right corner of the admin screen.
When you mouseover a commenter’s name you will see a tip appear displaying some information about that given commenter.