Thank Me Later

Sends thank you emails to blog commenters.

Widget Logic

This plugin gives every widget an extra control field called “Widget logic” that lets you control the pages that the widget will appear on.

The text field lets you use WP’s Conditional Tags, or any general PHP code.

There is also an option to add a WordPress ‘widget_content’ filter — this lets you tweak standard widgets to suit your theme without editing plugins and core code.

Event Registration

This plugin is designed to allow you to take online registrations for events and classes. 

WP-PageNavi

Adds a more advanced paging navigation to your WordPress site.

FBLike

Another Facebook like button plugin.

Hikari Enhanced Comments

Hikari Enhanced Comments enhances comments with features that make comments more visible and and becoming more exciting in website structure.

Things that you’ve been wanted to do, now can be done much easier.

Custom Post Type UI

Provides an easy to use interface to create and administer custom post types and taxonomies in WordPress.

WP-to-Twitter

WP-to-Twitter is an awsome WordPress-Plugin, which allows you to submit a shortmessage for every new Post you´ve submitted so far. You can configurate the URL-Shortening-Service and get a lot of new Users from the Social-Network Twitter.

WordPress.com Stats

Once it’s running it’ll begin collecting information about your pageviews, which posts and pages are the most popular, where your traffic is coming from, and what people click on when they leave. It’ll also add a link to your dashboard which allows you to see all your stats on a single page

Akismet

Popular Comment Spam prevention plugin and service by Automattic