If you plan to enroll in the Windows Azure Extra Small Instance beta program, please note that the Extra Small compute instance will be billed separately from other compute instance sizes. Compute hours included in the Introductory Special, MSDN Premium or Development Accelerator offers don't apply to Extra Small Instance hours. The Extra Small Windows Azure Instance is priced at $0.05 per compute hour and provides developers with a cost-effective training and development environment. Compute hours are calculated based on the number of hours that your application is deployed. Sign up for the beta on the Windows Azure Management Portal.  Requests will be approved on a first-come, first-served basis.