-> An account per one LIVE ID can be provisioned

-> An account can have multiple subscriptions

-> Maximum 6 SQL Azure server per single subscription can be provisioned

-> 150 SQL Azure databases can be created under a single server. Note that it is a soft limit. Have a look at: http://social.msdn.microsoft.com/Forums/en-US/windowsazurepurchasing/thread/40c99af7-c87f-4936-94d7-b777d7fe5a0b/

Related Posts:

BOL: SQL Azure Provisioning Model