Since the commercial release of Windows Azure many questions have been asked about the relationship between the billing portal and the developer portal, for example:

• How does a subscription in the billing portal relate to the development portal?
• What is the difference between the Account Owner and the Service Administrator?
• How many services can I create in one project?
• How many instances of compute is a service limited to?
• Which limits are variable and how do I go about changing them?

Patrick Butler Monterde has put together a great post that explains the answers to all this and more. Please let us know if we missed anything.