About "Upgrading to Rails 1.0"
Rails 1.0 introduces several changes which affect your 0.13.1 applications. We’ll examine each of them then walk through the upgrade.
We won’t need this guide next time: with 1.0 your apps are easier to configure, have a host of plugins available, and much of the “glue” code that makes up a new application has been pushed down into Rails itself. Future updates will end at gem install rails.
For the patient: read the release notes to learn more about what’s cooking in 1.0.