I have been working with Chef for the past three years. During this time I have developed a number of cookbooks, recipes, and custom resources to automate the deployment of applications and infrastructure.
For example, I recently wrote a cookbook to deploy a web application stack consisting of Apache, MySQL, and PHP. This cookbook included recipes to install and configure the necessary packages, create a database, and configure the web server. Additionally, I wrote custom resources to automate the deployment of the application code and to configure the web server with the necessary virtual hosts.