WordPress Blog Plug In tools

AjaxWP -  Adds AJAX to all aspects of your WordPress site, which speeds up the load times.Alexa Rank – Display your Alexa rank with pride.

Ajax Comment Preview – Allows readers to preview their comment before submitting.

asTunes – Retrieves data from your Audioscrobbler/last.fm profile and posts it as a list on your blog.

Codebox – Creates a side scrolling box for displaying code snippets.

Crossroads – Adds thumbnails and comments from your Flickr account.

FireStats – Full featured statistics including referrers and popular pages.

Google PageRank – Allows you to display your Google Page Rank on your blog.

Hardened-Trackback – Generates a single-use trackback to help fight trackback spam.

imgViewJX – Refreshes an image on your main page from a selected directory.

Live Spell Checker – Adds a spell checker to your posts in the admin area.

Plug ‘n’ Play Google Map – If you include longitude and latitude in your post, this will automatically add it to a Google Map on a separate page. Very useful for blogs writing restaurant reviews or about events.

WordPress Mailing List – Have a mailing list? Let readers subscribe and unsubscribe from the front page of your site.

WP e-Commerce – Adds a shopping cart to your WordPress powered site.

WP-Polls – Adds fully customizable polls to your blog.

WP-Post Ratings – Allows readers to rate your posts.

Zorpia That’s Hot Box – Allows visitors to send posts they like to Zorpia.com and vote on their favorites.

AJAX Comments 2.0 – – Auto updates the comments page with no full reload, enabling much smoother commenting than the older full reload system.

AJAX Google Video Search – Search Google Video without leaving your favorite blog.

AJAX Shoutbox – Real time conversation with sound to alert you to new messages.

Cool Weather – Allows visitors to see the weather forecast for any location they choose.

Currency Converter – Adds a real time currency converter to the page with data from Yahoo Finance.

Google AJAX Search – Allows you to setup search for your site, the web, and another site such as your Flickr account.

Google MapSearch Widget – Allows readers to search Google Maps without ever leaving the page.

Gregarious – Social bookmarking plugin that adds Digg, Reddit, Feedburner FeedFlare buttons and more.

Hottaimoijiruna – Adds a self-updating clock to the site for a timezone defined by the blogger.

Inline Ajax Comments – Hides comments until the user clicks on them.

Inline Ajax Page – Displays a snippet of a post and then allows the reader to click a button to load the full entry without going to another page.

Tagboard Widget – Adds an auto-updating tagboard to your site that displays new messages as they are posted.

Units Converter – Converts hundreds of different units of length, area, volume, weight / mass, and speed without reloading the page.

WP Movie Ratings – Combines data from IMDB with the blogger’s movie review and allows the readers to add their own ratings.

XDTalk – Allows real-time conversation between registered users.

Akismet -  – Anti-spam plugin from the creators of WordPress that uses a central database of spam comments to identify spam. Requires a free API key from WordPress.com

Spam Karma – Analyzes comments for spam based on a karma system.

Bad Behavior – Prevents spam bots from accessing your site by analyzing their HTTP requests.

Did You Pass Math? – Asks users a simple math question before their comments are posted.

Comment Timeout – Closes comments on old posts.

Encourage Commenting

BlogFollow – Shows a snippet of the user’s blog beneath their comment.

DoFollow – Removes “nofollow” attributes from links in comments so search engines can follow them.

DoFollow Trackbacks – Removes “nofollow” attributes from trackbacks.

Show Top Commentators – Lists your most frequent commenters along with links to their blogs.

Improve Appearance

Nicer Trackbacks – Improves the appearance of trackbacks from other blogs.

WP-NoSh*t – Filters bad words from comments.

Numbered Comments Adds numbers to comments.

AuthorHighlight – Highlights comments by the blog’s author.

Comment Highlighter – Styles comments based on the author’s name, email, or URL.

wp-chunk – Truncates long URLs in comments to prevent them from stretching the page.

Enable Rich Comments

Custom Smileys – Adds clickable smiley emoticons to comments.

TinyMCEComments – Turns the comment box into a full-featured rich text editor.

Live Comment Preview – Allows readers to preview their comment before posting.

Edit Comments XT – Allows users to edit their own comments.

Enable Avatars

Gravatar – Displays user-selected avatars next to comments.

Favatars – Pulls the favicon from a commenter’s blog or website and uses it for their avatar.

MBLA – Adds user images from MyBlogLog to comments.

OpenID Comments – Lets readers comment with their OpenID identity.

Click here to find the rest.