1) The document discusses using JRuby to deploy and scale Ruby applications. JRuby runs Ruby code on the Java Virtual Machine (JVM), allowing for features like deployment automation, background jobs, and clustering. 2) It provides examples of using tools like Warbler, Trinidad, and TorqueBox to package and deploy JRuby applications to servers like Tomcat, as well as to PaaS providers. These tools automate deployment and add capabilities like background processing. 3) JRuby and tools like TorqueBox are said to allow applications to scale horizontally by deploying across multiple servers for high availability and load balancing, helping applications "Deploy, Scale and Sleep at Night."