This document summarizes a presentation titled "Adding 1.21 Gigawatts to Applications with RabbitMQ" given by James Titcumb at the PHP UK Conference 2015. The presentation introduces message queueing and background processing using RabbitMQ. It demonstrates how to install and use RabbitMQ for basic queuing with a producer and consumer. It also covers more advanced RabbitMQ concepts like fanout, direct, and topic exchanges as well as clustering for high availability and scaling. Real-world examples are provided and the slides can be accessed on GitHub for hands-on learning.