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If you have deployed apps to Heroku you know that you cannot write to the read-only file system that Heroku offers. For file uploads you have to use some storage provider like Amazon S3 or RackSpace CloudFiles. Now, if your application (I’m assuming you’re already on Rails 3), is using Haml + Sass, you’re in some trouble. Sass is set to generate CSS files on the fly and save them to public/stylesheets so the can be served like static content....