Twitter's Bootstrap v2 has recently been released. Unfortunately it was designed for the CSS pre-processor LESS and not SASS. This package contains the SCSS-ified version of it along with a guide on how to get it installed.
I apologise for any errors as this is the first community project (albeit a small one) that I have done.
This is designed to work under the new asset pipeline.
There isn't a lot that you have to do to get this all ready and working, but here are the steps:
Drop bootstrap.scss and the bootstrap folder into the /vendor/assets/stylesheets folder.
Add the following line of code to app/assets/stylesheets/application.css
If you wish to have Bootstrap included in all the views on your site (and you are using HAML), add the following line of code to your app/views/layouts/application.html.haml
= stylesheet_link_tag "application", :media => "all"
Include all your CSS definitions below the @import in the app/assets/stylesheets/application.css file.
This should get you all up and running. Enjoy!