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Akismet checks your comments against the Akismet web service to see if they look like spam or not. You need a WordPress.com API key to use it. You can review the spam it catches under “Comments.” To show off your Akismet stats just put <?php akismet_counter(); ?> in your template.
See also: WP Stats plugin. By Matt Mullenweg.

Adds a breadcrumb navigation showing the visitor’s path to their current location.
For details on how to use this plugin visit Breadcrumb Nav XT. By Michael Woehrer.

Generates a fully customizable sitemap
By Dagon Design.

This plugin will generate a sitemaps.org compatible sitemap of your WordPress blog which is supported by Ask.com, Google, MSN Search and YAHOO. Configuration Page By Arne Brachhold.

Insights allows you to quickly access and insert information (links, images, videos, maps..) into your blog posts.
By Vladimir Prelovac.

Used to overlay images on the current page. Lightbox JS v2.2 by Lokesh Dhakar. Mad props to Tanin for his crucial regular expression code! You rock!!
By Rupert Morris.

Saves your wordpress blog from getting tagged as ping spammer by installing this plugin.
By MaxBlogPress.

WordPress 2.5+ ONLY. Enhance your Registration Page. Add Custom Logo, Password Field, Invitation Codes, Disclaimer, Captcha Validation, Email Validation, User Moderation, Profile Fields and more.
By Skullbit.

Advanced search engine that provides full text searching across posts, pages, comments, titles, and URLs. Searches take into account any data added by other plugins, and all search results are contextually highlighted. You can also highlight incoming searches from popular search engines.
By John Godley.

SEO Smart Links provides smart interlinking for your blog and additional SEO features for advanced users.
By Vladimir Prelovac.

Express yourself and your blog through a unique representation of your posts.
By Vladimir Prelovac.

Automatically add links on your posts to popular social bookmarking sites. Go to Options -> Sociable for setup.
By Joost de Valk.

Allows readers to receive notifications of new comments that are posted to an entry.
Based on version 1 from Scriptygoddess By Mark Jaquith.

A complete integration between your WordPress blog and Twitter. Bring your tweets into your blog and pass your blog posts to Twitter. Configure your settings here.
By Alex King.

Easily embed videos from various video websites such as YouTube, DailyMotion, and Vimeo into your posts.
By Viper007Bond.

Show a mobile view of the post/page if the visitor is on a known mobile device. Questions on configuration, etc.? Make sure to read the README.
By Alex King.

wp thread comment allow user can reply comment and same comment On display, can choose ajax or not.
By 偶爱偶家.

Displays a printable version of your WordPress blog’s post/page.
By Lester ‘GaMerZ’ Chan.

Automatically finds tags based on your post content.
By iDope.

The wpSEO plugin helps you optimize your blog for SEO purposes by eliminating issues with duplicate content and specifying meta tags and page titles for the different pages of your blog.
By Sergej Müller.

Returns a list of the related entries based on keyword matches, limited by a certain relatedness threshold. New and improved, version 2.0! By mitcho (Michael Yoshitaka Erlewine).