Some resources to get started using some handy tools for ruby/rails development
RVM is awesome. Manage the version of ruby you’re using and the gems for each version and/or project with ease. Super handy. All the pain of changing ruby versions on the mac is eliminated.
Get your BDD on with Rspec, and then automate with Autotest. No more autospec layer for Rspec 2 – Autotest is directly integrated these days. Let your machine run the tests for you as you write/update code. The growl plugin for development on the mac is slick as well. This is what development should be like.