With the upcoming final release of Ruby on Rails 3 around the corner, get up to speed quickly with the following 34 resources:

Overviews

Rails 3.0 Release Notes - RailsGuides is an invaluable resource for all Ruby on Rails developers. The Rails 3 release notes provides a great overview the api changes and new features added to the framework.

RailsPlugins.org – Find out if your plugins work in Rails 3.

Having Ruby on Rails 3 My Way - A tutorial on how to setup Rails 3 with Mongoid, Haml, jQuery, and RSpec with Factory Girl.

The Rails Module (in Rails 3) - Nick Quaranto outlines some helpful methods in the Rails module.

Rails 3 I18n changes - A quick walkthrough the changes made to I18n.

Ruby on Rails 3 Screencast series - The official Ruby on Rails site screencast series by Gregg Pollack.

ActionController / Rack

Embracing REST with mind, body and soul - José Valim introduces RESTful responders within Rails 3 controllers.

Railscasts #224 Controllers in Rails 3 – Ryan shows us what’s new with Rails 3 controllers.

Render Options in Rails 3 - Yehuda goes through the rendering options available in Rails 3.

Adding Routes for tests / specs with Rails 3 - Jeff Dean outlines how to verify routes in our specs.

32 Rack Resources to Get You Started - A great collection of links to get you familiar with rack.

ActionMailer

New ActionMailer API in Rails 3.0 - Mikel Lindsaar demonstrates how to use the new ActionMailer.

A Whole New ActionMailer - Mikel Lindsaar’s Rails Dispatch post giving a tour of the ActionMailer features.

ActiveRecord/ActiveModel

ActiveModel: Make Any Ruby Object Feel Like ActiveRecord – Yehuda writes about the modularity of ActiveModel.

Railscasts #219 Active Model - See how to include certain ActiveModel modules to tableless models.

ActiveRelation: ActiveRecord Gets a Facelift - Carl Lerche introduces the new ActiveRecord finder api.

Active Record Query Interface - Pratik gives an overview of the changes made to the ActiveRecord query interface since Rails 2.

Bundler

Gembundler.com -The official project site for Bundler that includes extensive documentation.

Library Management Gets an Update in Rails 3 - Andre Arko gives an overview about bundler for the Rails Dispatch blog.

Railscasts #201 Bundler - A Railscasts by Ryan Bates demonstrating how to use bundler with Rails 3.

AdventuresInCoding.com screencast on Bundler – Our very first screencast from last February.

Railties

Rails 3 Internals: Railtie & Creating Plugins - Ilya Grigorik goes over Railties in Rails 3.

rails-templater - A template project which generates a greenfield Rails 3 application.

Making generators for Rails 3 with Thor – A tutorial showing you how to use the new generators and how to bundle them in a gem.

Routes

The Lowdown on Routes in Rails 3 - Rizwan Reza gives us a great summary of all the different ways to create routes in Rails 3.

Rails Routing from the Outside In - RailsGuide documentation about the new router.

Plugins

Plugin Authors: Toward a Better Future - Yehuda goes through the changes for making plugins in Rails 3.

Customizing Rails Apps with Plugins - José Valim gives an overview of using responders, simple form, devise, and mail form plugins.

Devise 1.1 is out and ready to rock with Rails 3 - Outlines some new feature in Devise 1.1 including being able to authenticate a given url in the router!

Books

Beginning Rails 3 – Cloves Carneiro Jr and Rida Al Barazi bring us a great beginner Rails 3 book with examples viewable in gists.

The Rails 3 Way - The ultimate Ruby on Rails reference by Obie Fernandez.

Rails 3 In Action - Ryan Bigg and Yehuda Katz deliver a great Rails book which teaches readers Rails by doing BDD with Cucumber and RSpec.

Rails 3 Upgrade Handbook - Jeremy McAnally’s book gives you 120 pages of information about upgrading your Rails 2 application to version 3.

Ruby on Rails Tutorial: Learn Rails by Example – Michael Hartl’s ebook that teaches Rails step by step.

Update: Rails 3.0.0 was released on August 29th, 2010. To get more details, be sure to read the official announcement.