Online Ruby on Rails Courses

Peepcode

Excellent screencasts from Geoffrey Grosenbach, $9 each, typically about an hour each, on specific Rails-related topics.

Railscasts

A long series of short, very specific screencasts showing how to accomplish various tasks with Ruby on Rails, all provided for free by Ryan Bates.

Learning Rails Online Course

A free online course created by Michael Slater and Christopher Haupt. Audio podcasts cover the concepts behind Rails, then screencasts show how to build a simple application.

Free Rails Learning Tool

YoYoBrain.com is a free, online learning community of shared user-generated content. Useful for finding & memorizing Ruby on Rails concepts.