Ruby References

Ruby Quick Reference
http://www.zenspider.com/Languages/Ruby/QuickRef.html

Rails References

Downloadable Rails API with Javascript http://www.railsbrain.com/ (Preferred)

Official Rails API http://api.rubyonrails.org/

GotAPI
http://www.gotapi.com/html

Naming Conventions

RubyOnRails Naming Conventions from ITSignals
http://itsignals.cascadia.com.au/?p=7

RubyOnRails.org TipSheetForBeginners
http://wiki.rubyonrails.org/rails/pages/TipSheetForBeginners

Tutorials

AkitaOnRails: Rails 2.0 First Full Tutorial
http://www.akitaonrails.com/2007/12/12/rolling-with-rails-2-0-the-first-full-tutorial

Blogs

AkitaOnRails
http://www.akitaonrails.com

Books

The Ruby Way
http://rubyhacker.com/