Summary:  Your CTO wants to know your cloud computing strategy — and wants to know it tomorrow. There are a lot of choices, with many differences and similarities. This article explores some of the options for an organization that wants to leverage the power and promise of cloud computing, with a focus on open source technologies. Learn about several of the providers, such as Amazon, Microsoft®, Google, IBM®, Aptana, Heroku, Mosso, Ning, and Salesforce. Review the relative strengths and weaknesses of each platform, and what types of open source and proprietary technologies are supported on each platform. Learn how to pick the platform that fits your needs.