I know Django fairly well, and want to learn Rails. Mostly, it is to know what am I missing in Django, and to port what I learn learning rails to do better Django. How should I start?
You can answer the question so it is general enough that other people may learn, but in case you want too answer something specific to me, here is what I know. I know a few languages/frameworks fairly well.
Php: Basics
Struts: Well
A few other Oracle specific frameworks: (http://www.oracle.com/technology/products/adf/index.html): Well.
Django: Very well.
[Edit]: I prefer a ebook. It does not need to be free, though.