Development resources

New to Ruby?

Programming Ruby This Pragmatic Programmer book is a good free introduction to ruby. It is based on an older version of ruby (1.6) and will serve as a good introduction. I wouldn't expect that you'd find any differences until you got into the more complex topics. The more recent edition is for sale, if you wish.
tryruby.org Try ruby from the comfort of your browser. A nice tutorial to walk you through the basics of Ruby.
Ruby Koans Useful if you've seen Ruby before but want to stretch your wings a little.

Rails for Zombies An entertaining and effective tutorial to get you started in Rails.
Rails tutorial book A fairly comprehensive walk through of what Rails has to offer.
The Rails Book The canonical Rails book. Sadly, not available for free. Has an introduction to ruby in the appendix.

The Git branching guide walks you through our workflow for contributing to the project.
Github learning course Screencasts + text.
Git Introductions A list of many different references, compiled by the makers of Git.
gitref.org Approaches the subject from a slightly different angle. Maybe you'll like it, maybe you won't.
Pro Git Free online book. Very thorough, yet surprisingly readable.

Check out the mentor list on [plansdev] and make contact with someone directly.

Api Dock Searchable API for Ruby, Ruby on Rails, and Rodc that allows people to add helpful comments/examples.
Rails API This version is searchable and awesome. You can view it online or download your own bundle. I recommend the version with both Ruby and Rails included.
Rails Guides Covers all the topics that are hard to learn from the API. My favorites are: Testing, Layouts and Rendering, Routing, and The Query Interface.

The main docs page is here. I didn't find the 2-minute tutorial very useful, though. The good stuff is in the other links.