A pretty comprehensive tutorial on how to use Rails with Subversion. There are many tricks that are applicable to other projects that use subversion.
Plugins are self-contained libraries made specially for Rails. They are a great way to reuse someone else’s code or to package your own code for reuse.
As the title says
Setting up a Rails Development Environment on Windows Using Eclipse
Installing Ruby on Rails on Debian system
James Duncan Davidson lists some great tips about deploying Rails apps.
This is a Switchtower task you can use for your Dreamhost account.