Amazon AWS just announced DevOps (beta) a no-charge solution for managing applications in the AWS cloud using Chef recipes, built on technology developed by Peritor, the creators of Scalarium, which was acquired by AWS in 2012:
AWS OpsWorks is a DevOps solution for managing applications of any scale or complexity on the AWS cloud. AWS OpsWorks features an integrated experience for managing the complete application lifecycle, including resource provisioning, configuration management, application deployment, software updates, monitoring, and access control.
AWS OpsWorks lets you model and visualize your application with layers that define how to configure a set of resources that are managed together. You can also define the software configuration for each layer, including installation scripts and initialization tasks. When an instance is added to a layer, all the configuration steps are applied for you. AWS OpsWorks promotes conventions but is flexible enough to let you customize any aspect of your environment. Since AWS OpsWorks uses Chef recipes, you can leverage hundreds of community-built configurations such as PostgreSQL, Nginx, and Solr.