Just a little tip for those wanting to learn RoR.

1. Tutorials and in-depth guides online are essentially non-existent. Go out and get Agile Web Development. Sometimes you can find the PDF version alone for a good discount.

2. Agile Web Development version 2.0 uses Rails 1.2.3. If you try to go through the demos with the latest Rails, you'll come across a lot of problems. Before starting a new rails project, do this:

gem install -v=1.2.3 rails

rails _1.2.3_ pojectName

You should now be able to follow the book.