SQL Server 2008 samples are now available at http://codeplex.com/SqlServerSamples . That's our portal page to many different product and community projects on CodePlex with samples for SQL Server. On the releases tab of the portal page you'll find installers...

Great news! SQL Server 2008 is now available for download for MSDN subscribers from http://msdn.microsoft.com/en-us/subscriptions/downloads/default.aspx . We're putting the finishing touches on the samples and should have updated installers available...