Spam Karma 2 (SK2) is an anti-spam plugin for the WordPress blogging platform. It is meant to stop all forms of automated Blog spam effortlessly, while remaining as unobtrusive as possible to regular commenters. Spam Karma 2 is the proud successor to Spam Karma, with whom it shares most of the development ideas, but absolutely none of the code. You can imagine the popularity of this plugin by looking at over 1900 comments under the post.

Pricing: Free
Requirements: WordPress 1.5.1+
Source: http://unknowngenius.com/blog/wordpress/spam-karma/

Get Recent Comments displays excerpts of the most recent comments and trackbacks that have been posted to the articles in your blog. It can handle trackbacks and comments in separate lists which I found really useful. It has Widget support. It has an option to exclude comments to posts in certain categories as well.

Pricing: Free
Requirements: -
Source: http://blog.jodies.de/archiv/2004/11/13/recent-comments/

Theme Test Drive Wordpress plugin allows you to safely test drive any theme on your blog as administrator, while visitors still use the default one. It happens completely transparently and they will not even notice you run a different theme for yourself. Best part is you can even set the testing theme options in the Admin panel while you are testing the theme.

It turns out to be really useful for bloggers when we are changing the theme slightly or creating a completely new theme for our blogs. We do not have to create another temporary wordpress blog in order to test the new theme. I totally recommend this plugin to every blogger.

Pricing: Free
Requirements: -
Source: http://www.prelovac.com/vladimir/wordpress-plugins/theme-test-drive

Social bookmarking allows users to submit, comment on, and “promote” websites. The Gregarious plugin supersedes the Digg This Reloaded Plugin and allows for seamless integration between your Wordpress Blog and social bookmarking sites such as Digg.com, Del.icio.us, Reddit and more. Requiring no editing of templates, and a simple point and click interface, Gregarious is the ultimate social bookmarking plugin for Wordpress. There is one downside of this plugin only, due to time constraints, the author is no longer guarantee support for this plugin.

Pricing: Free
Requirements: -
Source: http://lipidity.com/web/wordpress/wp-plugin-gregarious/

Title tags are arguably the most important of the on-page factors for search engine optimization (”SEO”). Post titles are also used as title tags by WordPress, considering that post titles should be catchy, pithy, and short-and-sweet; whereas title tags should incorporate synonyms and alternate phrases to capture additional search visibility.

SEO Title Tag makes is dead-easy to optimize the title tags across your WordPress-powered blog or website. Not just your posts, not just your home page, but any and every title tag on your site! If this plugin, along with a few hours of keyword research and copywriting of optimized titles, doesn’t make a significant impact on your search traffic, you’re doing something wrong.

Pricing: Free
Requirements: -
Source: http://www.netconcepts.com/seo-title-tag-plugin/

Global Translator is a free and open source Wordpress Plugin which is able to dynamically translate your blog in the following thirteen different languages: English, French, Italian, German, Portuguese, Spanish, Japanese, Korean, Chinese, Arabic, Russian, Greek, Dutch.
The number of available translations will depend on your blog language and the translation engine you will chose to use. The most powerful features which Global Translator provides are:

Double Translation Engine System

it has the ability to provide the translations by using both Google Translation Engine and Babel Fish

Search Engine Optimized

it uses the permalinks by adding the language code at the beginning of all your URI. For example the english version on www.domain.com/mycategory/mypost will be automatically transformed in www.domain.com/en/mycategory/mypost

Fast Caching System

a built-in cache is provided in order to reduce the online connections to the translation engines

Fully configurable layout

you can easily customize the appearance of the translation bar by choosing between a TABLE or DIV layout for the flags bar and by selecting the number of translations to make available to your visitors

Pricing: Free
Requirements: WordPress 2.0+
Source: http://www.nothing2hide.net/blog/wp-plugins/wordpress-global-translator…

The current default WordPress administration area is functional, but OrderList felt it could be improved. Would you like to have a new look for your WordPress adminstration area? WordPress Tiger Adminstration looks really nice and improved the usability. The author didn’t want to touch the XHTML framework of the admin, but instead relied on the power of CSS2 to manipulate the presentation. The whole package has been wrapped up into a single plugin. Just install and activate. The new design will be immediately visible. Take a look at the following screenshots, you would like to install this plugin immediately.

Pricing: Free
Requirements: -
Source: http://orderedlist.com/wordpress-plugins/wp-tiger-administration/

There are hundreds of plugins and services which can provide statistics about your visitors. However skeltoac found that even though something like Google Analytics provides an incredible depth of information, it can be overwhelming and doesn’t really highlight what’s most interesting to me as a writer. That’s why Automattic created its own stats system, to focus on just the most popular metrics a blogger wants to track and provide them in a clear and concise interface.

Installing this WordPress.com Stats plugin is much like installing Akismet, all you need is to put in your API Key and the rest is automatic.

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. Less is more.

Finally, because all of the processing and collection runs on their servers and not yours, WordPress.com Stats plugin doesn’t cause any additional load on your hosting account. In fact, it’s one of the fastest stats system, hosted or not hosted, that you can use.

Pricing: Free
Requirements: WordPress 2.1+
Source: http://wordpress.org/extend/plugins/stats/

Subscribe to Comments is a plugin that allows commenters on your blog to check a box before commenting and get e-mail notification of further comments. It is one of the most popular WordPress plugins out there for the simple reason that it helps foster a community around your blog by encouraging commenters to come back and stay engaged in the dialog.

Features

• Rudimentary security
• Recognition of subscription status
• Themeable subscription manager
• Ability to let users change notification e-mail address
• Easy integration into comments form
• Subscription without leaving a comment
• Customization
• Internationalization

Pricing: Free
Requirements: WordPress 2.2+
Source: http://txfx.net/code/wordpress/subscribe-to-comments/

WordPress by default doesn’t come with any sort of web site reporting tools (and it really shouldn’t). So if you want to know how many people visited your site, which pages they viewed, or where they came from, you’ll need to either rely on your raw web logs or use an online tracking service provided by a third party.

Google Analytics and Feedburner Reports plugin for WordPress allows you to easily view your Google Analytics and Feedburner reports in your WordPress administration area. It adds a top-level Reports tab and when you click on it, you’ll get a quick 7 day overview of what’s going on with your site (pageviews, visits, referrers, etc). You’ll have to login to Google Analytics or Feedburner directly if you want more detailed stats.

Features:

• Provides you with a birds-eye view of what’s going on with your site
• Retrieves data from Google Analytics and Feedburner
• Reports are represented visually with graphs
• Choose the reports you want to view
• Ability to automatically install the Google Analytics tracking code for you, along with optional outbound link tracking.
• Includes a WordPress widget to display your most popular content.
• Automatically check for updates to the plugin

Pricing: Free
Requirements: -
Source: http://tantannoodles.com/toolkit/wordpress-reports/