TubePress

Beautiful video galleries on your WordPress site.

http://tubepress.org/

Dynamic "To Top" Plugin

This WordPress plugin adds an automatic and dynamic "To Top" button to easily scroll long pages back to the top.

http://wordpress.org/extend/plugins/dynamic-to-top/

Disqus Comment System

Disqus, pronounced "discuss", is a service and tool for web comments and discussions. Disqus makes commenting easier and more interactive, while connecting websites and commenters across a thriving discussion community.

http://wordpress.org/extend/plugins/disqus-comment-system/

OpenID

OpenID is an open standard that allows users to authenticate to websites without having to create a new password. This plugin allows users to login to their local WordPress account using an OpenID, as well as enabling commenters to leave authenticated comments with OpenID. The plugin also includes an OpenID provider, enabling users to login to OpenID-enabled sites using their own personal WordPress account. XRDS-Simple is required for the OpenID Provider and some features of the OpenID Consumer.

http://wordpress.org/extend/plugins/openid/

Share and Follow

Designed for average users to use, ideal for developers who want to save time, this plugin gives links to the most prominent Social Networking sites for sharing and following, presented in many different formats (widgets/shortcode/template tag/auto added). Optional subscriptions for extra 25 icons sets. I use this plugin for the widget feature.

http://wordpress.org/extend/plugins/share-and-follow/

Lightbox Plus

Lightbox Plus implements ColorBox as a lightbox image overlay tool for WordPress. ColorBox was created by Jack Moore and is licensed under the MIT License. Lightbox Plus for WordPress implements ColorBox as a lightbox image overlay tool for WordPress. ColorBox was created by Jack Moore and is licensed under the MIT License. Lightbox Plus permits users to view larger versions of images without having to leave the current page. Lightbox is able to add a lightbox to WordPress gallery images, display simple slide shows, video, forms and external content in overlays. The use of the dark or light background, which dims the page over which the image has been overlaid, also serves to highlight the image or video being viewed. Lightbox Plus captures the image title for display in the overlay.

http://wordpress.org/extend/plugins/lightbox-plus/

MailChimp List Subscribe Form

The MailChimp plugin allows you to quickly and easily add a signup form for your MailChimp list as a widget on your WordPress 2.8 or higher site.

http://wordpress.org/extend/plugins/mailchimp/

Analytics360

MailChimp's Analytics360 plugin allows you to pull Google Analytics and MailChimp data directly into your dashboard, so you can access robust analytics tools without leaving WordPress.

http://wordpress.org/extend/plugins/analytics360/

Social

Broadcast posts to Twitter and/or Facebook, pull in items from each as comments, and allow commenters to use their Twitter/Facebook identities. Brought to you by MailChimp, Social is a lightweight plugin that handles a lot of the heavy lifting of making your blog seamlessly integrate with social networking sites Twitter and Facebook.

http://wordpress.org/extend/plugins/social/

Shutter Reloaded

Shutter Reloaded is an image viewer for your website that works similarly to Lightbox, Thickbox, etc. but is under 10KB in size and does not require any external libraries. It has many features: resizing large images if the window is too small to display them with option to show the full size image, combining images in sets, redrawing the window after resizing, pre-loading of neighbour images for faster display and very good browser compatibility.

http://wordpress.org/extend/plugins/shutter-reloaded/

FAQ You

A simple FAQ plugin where you can create Categories and put Questions in them. You can easily insert them in a page with the WYSIWYG editor. Able to turn JavaScript on or off.

http://wordpress.org/extend/plugins/faq-you/

WordPress CSS Drop-down Menu

Use WordPress' nav menu system to create left/right widget flyouts, with support for Superfish

http://wordpress.org/extend/plugins/wordpress-css-drop-down-menu/

AddToAny

Help people share, bookmark, and email your posts & pages using any service, such as Facebook, Twitter, Google, StumbleUpon, Digg and many more.

http://wordpress.org/extend/plugins/add-to-any/

ShareThis

ShareThis offers the most innovative sharing platform for today's social audience. Our suite of solutions for advertisers and publishers inspire people to do more of what we believe is the foundation of digital life - to share.

http://sharethis.com/

Akismet

Used by millions, Akismet is quite possibly the best way in the world to protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep

http://akismet.com/

WP-reCAPTCHA

WP-PageNavi

WordPress Database Backup

On-demand backup of your WordPress database.

http://austinmatzko.com/wordpress-plugins/wp-db-backup/

Wordbooker

Visitor Maps and Who's Online

TinyMCE Advanced

Really simple Facebook Twitter share buttons

Puts Facebook, Twitter, LinkedIn and other share buttons of your choice above or below your posts.

http://www.whiletrue.it/en/projects/wordpress/22-really-simple-facebook-twitter-share-buttons-per-wordpress.html

NextGEN Gallery

NextGen Gallery is a great plugin to host your own photo gallery. Its a big upgrade from the built in image features of WordPress. You can even embed galleries into your post or pages.

http://alexrabe.de/wordpress-plugins/nextgen-gallery/

Google XML Sitemaps

Google Analytics for WordPress

This plugin makes it simple to add Google Analytics to your WordPress blog, adding lots of features, eg. custom variables and automatic clickout and download tracking.

http://yoast.com/wordpress/google-analytics/