Microsoft has Released To Manufacturing available for SQL Server 2008. Released To Manufacturing (RTM) means that code of SQL Server 2008 has been approved by MS team and it is being send to manufacture. It will be while before it is available on distribute media on store shelves.
Currently it is available for download by MSDN and TechNet subscribers.
I want to congratulate MS SQL Server team for releasing the version of SQL Server on time.
Reference : Pinal Dave (https://blog.sqlauthority.com)