I\'m working on a Rails app that currently uses Rails 1.2, so I\'m now quite a long way behind the latest stable release (Rails 2.3).
How should I go about the process o
I think there are some Rails rake tasks out there you could get that will look for deprecations in your app.
And as long as your app's in version control, I'd do the upgrade in one shot, and go through the error messages one at a time.
Also, aside from the release notes pages you saw for 2.2 & 2.3, there should be release notes or change logs in the source itself. Plus, you can search for blog posts (use google blog search) with search terms like "rails x.x.x new features", etc.