We had a great presentation of the 100 best plugins to use on a WordPress.org website.  I got many of the plugins to use but the speaker Ryan Imel had to go fast due to time constraints.  But these plugins below are great!

Comment Plugins 

Akismet

Bad Behavior

Never Moderate Registered Users

Safe Report Comments

Antispam Collateral Condolences

Really Simple Captcha

Subscribe to Comments

WP Ajax Edit Comments

Minimum Comment Length

CommentLuv

After the Deadline

Comment Redirect

Social Plugins

Twitter Blackbird Pie

AddThis

WordTwit Pro

Feedburner Circulation

TentBlogger RSS Reminder

Content Plugins

Audio Player

Display Posts Shortcode

WP-Table Reloaded

Gravity Forms

Widget Logic

Widget Reloaded

BbPress

Blubrry PowerPress

Live Blogging

Viper Video Quicktags

TentBlogger Add RSS Footer

Simply Exclude

Content Audit

Widgets on Pages

Duplicate Widget

Video Press

Hierarchy

Query Posts

Spots

TentBlogger 404 Repair

Regenerate Thumbnails

Format Media Titles

Markdown on Save

Redirection

Community Plugins

Comment Form Quicktags

Poster Revision Display

Members

Restrict Usernames

BuddyPress

Achievements

What should we Write About Next?

WP Content Filter

TentBlogger Simple Top Blog Comments

GD Star Ratings

Performance Plugins

W3 Total Cache

Speed Trap

Use Google Libraries

Stat Plugins

Feedburner Feedsmith

Google Analytics for WordPress

WordPress Download Monitor

Site Improvement Plugins

Jetpack from WordPress.com

WordPress.com Stats

Email Subscriptions

WP.me URLs

Hovercard Popups

Easy Embeds

Twitter Widget

Sharedaddy

After the Deadline

Manual Control for Jetpack

All in One Favicon

Breadcrumb NavXT

WordPress SEO

WP-PageNavi

Local Time

WP Touch

WordPress.com Custom CSS

Yet Another Related Posts Plugin

Broken Link Checker

Dashboard Plugins

Login Logo

Expandable Dashboard Recent Comments

UI Labs

Menu Humility

Add Admin CSS

Featured Image Column

Don’t Break the Code

Drafts Dropdown

Color Admin Post

Admin Trim Interface

Admin Post Navigation

Matty Theme Quickswitch

Custom Post Type UI

Adminimize

Post Status Menu Items

Multi Author Plugins

Edit Flow

WP Help

User Switching

Co-Authors Plus

CollabPress

WP-Prowl

Commerce Plugins

WP-Commerce

Piggy

Jigo Shop

Woo Commerce

Security Plugins

VaultPress

VaultPress Status

Backup Buddy

Health Check

Hotfix

Login Lockdown

Remember Me Controls

WP Security Scan

Writing Plugins

TinyMCE Advanced

Revision Control

Duplicate Post

Fun Plugins

Let It Snow

Hello Dolly

Unicornify

Nyan Cat

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