Here is a list of the most important on-page ranking factors and how they are addressed by this All in One SEO plugin. You might want to visit Options - All in One SEO to tweak the default options.

Titles

The text that you see in your browser’s window bar is the most important thing *on* your page. Make sure your titles are getting rewritten and the important stuff (your post titles) always come before anything else. You can leave a few words from your blog title to do some branding but don’t overdo. If your post titles don’t contain your most precious phrases you want to rank for then tweak them. Leave the post titles as it is but change the meta title.

Descriptions

Once your pages rank in search engines your description (aside of course from your title) makes a potential visitor want to click through, or not. It’s mta descriptions, believed dead by many people, that decide over your site’s fate. If you don’t want to invest the time and write a description for every post at least let them be auto-generated. This vastly better than the usual “Share This … Posted on … under …” description that is often used. If a post has an excerpt it is used, but not if you specify an explicit description.

Keywords

All in One SEO Pack can generate them from your categories (this was the old way of tagging your posts in wordpress) or from Ultimate Tag Warrior or, starting with Wordpress 2.3, the built-in tagging system. Using your categories is optional, the rest is auto-detected and used if there.

Duplicate Content

You can have “noindex” and the like generated for archive-, category- and tag pages if you seem to have trouble with duplicate content.

Pricing: Free
Requirements: -
Source: http://wp.uberdose.com/2007/03/24/all-in-one-seo-pack/

Democracy adds polling functionality to your WordPress blog. It grew out of frustration with the only other WordPress polling option, WP-poll. It didn’t have valid markup, it was clunky, and it required one heck of an installation process. So Andrew decided to create my own, using WP-poll as a reference. This plugin uses AJAX for quick sending and loading of poll data, although it doesn’t depend on javascript to function. It is fully functional in non-javascript environments, meaning it will work in ALL browsers. The AJAX part is tested to work in Safari, Opera, Firefox, and IE6/Win.

It also has a full-featured admin panel, which allows one to manage their polls. You can activate, edit, delete, and add new polls from the admin panel. It is also harder to ballot-stuff than WP-poll. It uses cookies as well as IP logging to prevent users from working spamming the ballot box.

Pricing: Free
Requirements: -
Source: http://blog.jalenack.com/archives/democracy/

Intouch is a plugin for WordPress which allows you to insert a custom build contact form, which on submission will send the information via email.

Features

These are the list of features available in the current version.

• Customizable contact form with variable number of fields.
• Ability to specify mandatory fields.
• Can forwarded to any email address.
• Instant insertion using the Quicktag.
• Complete customization from admin panel.
• Instant submission using AJAX (for JavaScript supported browsers), and minimum overhead.
• Fall-back to standard HTML form submission, if JavaScript is not supported.
• Conforms to XHTML 1.0 Strict / XHTML 1.1
• Compatible to be served as application/xhtml+xml

Pricing: Free
Requirements: Wordpress 1.5+, Javascript Enabled
Source: http://adahas.com/work/intouch/

SRG Clean Archives plugin is designed to display your archive listings in a clean and uniform fashion that’s Search Engine friendly on a dedicated page or in your sidebar.

It lists the Month / Year, shows total post count for the month (enabled by default), the day of the month the article was published, the title of the article (permalink to article) and the number of comments (enabled by default) that have been made on each article.

If wanted, you can toggle on/off the moo.fx for collapsing months (on by default). If moo.fx is not enabled, your full archive display is shown but it’s still using the caching function.

Pricing: Free
Requirements: Javascript Enabled
Source: http://www.geekwithlaptop.com/projects/clean-archives/

Wordpress Automatic Upgrade is a plugin that automatically upgrades your wordpress version to the latest files provided by wordpress.org using the 5 steps provided in the wordpress upgrade instructions.

WPAU it helps you easily upgrading you to easily upgrade your wordpress installation to the latest version provided by wordpress, without having to download or upload any files.

In addition to this it automatically backups your current file and database and provides you with a link to download those. De-activates your plugins and remembers them so that after upgrading files it will re-activate those without you having to make any notes for which plugins you de-activated and the biggest saves you headaches of upgrading your wordpress installation.

Here is what WPAU does;

1. Backs up the files and makes available a link to download it.
2. Backs up the database and makes available a link to download it.
3. Downloads the latest files from http://wordpress.org/latest.zip and unzips it.
4. Puts the site in maintenance mode.
5. De-activates all active plugins and remembers it.
6. Upgrades wordpress files.
7. Gives you a link that will open in a new window to upgrade installation.
8. Re-activates the plugins.

The plugin can also can be run in a automated mode where in you do not have to click on any links to go to the next step.

Pricing: Free
Requirements: -
Source: http://techie-buzz.com/wordpress-plugins/wordpress-automatic…

Subscribers-only plugin lets you mark posts for subscribers-only. You can mark all posts in a category as subscriber-only, or mark individual posts regardless of category, or both. You define which roles are allowed to read subscriber-only posts. No template modifications are required.

When a post is marked as subscriber-only and your home page displays excerpts then the excerpt will be shown along with an optional “Subscribers-only” banner that you define. When a reader clicks on the link to go to the individual post page they must be logged in to read the post. If a person is not logged in then they will be presented a link to login or register.

Pricing: Free
Requirements: Wordpress 2.0+
Source: http://edwards.org/2006/03/07/subscribers-only-plugin…

WP-o-Matic makes autoblogging a snap by automatically creating posts from the RSS/Atom feeds you choose, which are organized into campaigns. WP-o-Matic aims to provide a very wide range of features. Currently, these are:

Features

• Campaigs Feeds and all settings and options are now organized into campaigns for the perfect organization and comfort.
• Multiple feeds / categories: it’s possible to add as many feeds as you want, and add them to as many categories as you want. It’s not obstrusive, so you can also write your own posts to any of those categories.
• Every form of XML syndication supported. This includes RSS 0.91 and RSS 1.0 formats, the popular RSS 2.0 format, and the emerging Atom.
• Feed autodiscovery, which lets you add feeds without even knowing the exact URL. (Thanks Simplepie!)
• Unix cron and Wordpress cron jobs For maximum performance, you can make the RSS fetching process be called by a Unix cron job, or simply let Wordpress handle it.
• Comfortable interface. The admin is powered by a state of the art ajaxy interface that lets you handle your feeds with ease. Updated!
• Images caching for extreme performance and hotlinking bypassing.
• Words Rewriting. Want to replace the word “Poker” with “Texas Holdem”? We have it covered. Want to use regular expressions? We have it covered.
• Words Relinking. Define custom links for words you specify.
• Post templating. Define a global header and footer for the posts, or even for a specific feed. Add ads
• Campaigns import/export using OPML files. Easily import hundreds of feeds into new or existing campaigns.

Pricing: Free
Requirements: -
Source: http://devthought.com/wp-o-matic-10-to-be-released/

Using Wp-SlimStat you can see detailed stats of your wordpress blog. It also filter details and stats using the filter form inside Details panel. Just type a domain (say google.com), choose “domain” radio-button, and submit data. The plugin will show you information related on that filter string. The same thing can be done with search strings, or referers. Here are the most important things about this plugin:

• imports wp-shortstat tables and data
• halved db size compared to wp-shortstat
• liquid layout: optimized for 1024×768 and 800×600
• metatags to show stats on your blog
• fully localizable
• improved browser and platform detection
• tracks Wordpress search form
• displays post titles for given resources
• shows visitors and unique IPs, not just hits
• use of a local ip-to-country database

Pricing: Free
Requirements: -
Source: http://dev.duechiacchiere.it/

WordPress Paged Comments is a plugin for WordPress 1.5 and 2.x to allow comment paging. Useful for those popular blog entries receiving many comments, or a simple guestbook page within WordPress.

Pricing: Free
Requirements: -
Source: http://www.keyvan.net/code/paged-comments/

WP-Polls adds an AJAX poll system to your WordPress blog. You can easily include a poll into your WordPress’s blog post/page. WP-Polls is extremely customizable via templates and css styles and there are tons of options for you to choose to ensure that WP-Polls runs the way you wanted. It now supports multiple selection of answers.

Pricing: Free
Requirements: Wordpress 1.5+
Source: http://lesterchan.net/wordpress/readme/wp-polls.html