There have been many enhancements to the Rails framework. These changes have effected the scaffolding, exception handling , collection fixtures etc. For details about these and other changes I recommend this page.
If you are looking for a Rails 2.0 tutorial, that actually works, then you should visit Fairleads. This tutorial works perfectly. It will help you get to grips with the basics of the Model-View-Controller design of Rails.
If you are using Windows use Instant Rails to get up and running quickly! Instant Rails is a complete package containing Ruby, Rails, Apache, and MySQL. It does not need to be installed. It runs from within a folder of your choice. It will not modify your system. It is not the best looking system, but it does the job well.
Obviously you can use Instant Rails and still follow the Fairleads tutorial. Where Fairleads uses the ‘work’ directory you should use the ‘rails_apps’ folder. You should have your Rails ‘exchange’ application up and running in no time…