Today, MSDN and TechNet Subscriptions published SQL Server 2008 simultaneously with the SQL Server team’s RTM.
These downloads are available to MSDN and TechNet Plus subscribers worldwide:
MSDN Top Subscriber Downloads
SQL Server 2008 Enterprise (x86, x64, ia64) MSDN Subscriber Downloads
TechNet Subscriber Downloads
TechNet Top Subscriber Downloads
SQL Server 2008 Standard (x86, x64) MSDN Subscriber Downloads
SQL Server 2008 Web (x86, x64)MSDN Subscriber Downloads
SQL Server 2008 Workgroup (x86, x64) MSDN Subscriber Downloads