The document lists 10 reasons why the open platform-as-a-service (PaaS) model is cool or awesome. It discusses features like using open source, popular programming languages like Java, Ruby and Node.js, connecting applications to services, deploying and scaling applications, creating tunnels, using any source control management system, and the platform being free for developers. The document promotes CloudFoundry as an open PaaS and provides links to samples and more information.