Treats different types of caching, over several blog entries, each builds on the last, towards more complex types of caching and how to implement them; and some advanced caching plugins written for customized caching. Rails Envy.

Free printable RoR cheat sheets in PNG and PDF format.

Custom onsite RoR training classes; by Webucator.

Practical introduction to features: command-line options, syntax, built-in variables, functions, many commonly used classes and modules. [Marakana Inc.]

Learn in simple, easy steps: installation, framework, strengths with examples, action pack, action view, active record, scaffolding, migrations, controller, views, layouts, AJAX. Free. Tutorials Point.

Several topics, with forum comments. Tutorialized.com.

How to use self-contained libraries made for Rails, to reuse other’s code or package your own. Unlike gems, plugins install in Rails applications so it is easier to deploy them remotely with full applications.

How to package helper methods as plugins, which shows basics of making any kind of code-based plugin.

List with descriptions, links, many forum comments. [Digital Media Minute]

Simple, brief "hello world" program, text and code samples, wiki-based.