The video titled "Ruby Queue" features a presentation by Ara T. Howard at the MountainWest RubyConf 2007. In this talk, Howard delves into RQ, a command line tool for building instant Linux clusters using the Ruby programming language. He emphasizes that RQ allows any user with basic Linux knowledge to set up a cluster in a matter of minutes, making it especially useful in scientific environments where large-scale computations are needed.

Some key points discussed include:
- Introduction of RQ: Howard explains the purpose of RQ as a tool designed for managing jobs across multiple nodes in a Linux cluster, allowing for efficient batch processing of tasks in a distributed system.
- Development Background: He recounts his experience at the NOAA, where the need for orchestration of numerous Linux boxes led him to develop RQ. The initial struggles with existing solutions like OpenMosix and SGE prompted him to create a simpler, more tailored solution.
- Architecture and Design Choices: Howard discusses the architecture of RQ, focusing on job queues, node isolation, and minimization of administrative overhead. He highlights his preference for using NFS for shared storage due to its availability despite its complexities.
- Locking Mechanism: The presentation details his approach to creating a locking mechanism for NFS to avoid file access conflicts, which led to the development of a LockFile class to manage concurrent processes effectively.
- Database Utilization: Howard chose SQLite as the underlying database for job management, attributing its robustness and effectiveness in handling shared access as key factors in RQ's success.
- User Experience and Features: He illustrates the simplicity of RQ through a demonstration of its command line interface, showing job submission and monitoring capabilities.
- Practical Use Cases: Throughout his talk, Howard offers examples of scenarios where RQ has been successfully implemented, including processing satellite data and generating images swiftly on a Linux cluster.

In conclusion, Howard emphasizes that RQ has become a mature and reliable tool for scientists and developers needing to manage distributed computing tasks effectively. The lessons learned throughout the development process underline the importance of zero administration, robust data management, and the realization that many users require more computing power rather than just managing data. The talk ends with an invitation for questions from the audience, highlighting Howard's collaborative spirit and openness to feedback.