A while back I posted about Visual Studio 2008 & .NET 3.5 Service Pack 1 (Beta). This was on May 14th. Based on the download text for SQL Server 2008 RTM, Service Pack 1 is a required dependency and will be available after August, 11th.
Also, the .NET Rocks PodCast #365 announces that SP1 is already available so the show must have been released a few days earlier than expected :-) The description on the web site for this PodCast states that SP1 will ship around August 11th as well.
At any rate, it appears that SP1 will be available within the next week.