Earlier today .NET Framework 3.5 and Visual Studio 2008 SP 1 were released. I wrote about the new features earlier and this still looks like an amazing service pack. Some of the highlights:

1. The improved performance of the installation of the service pack compared to the vs2005 sp. And the fact that the final sp will install over the beta, no need to uninstall. Update: The final version won't install over the Beta SP, you have to run the "Service Pack Preparation Tool" first.
2. Inclusion of the Entity Framework, this is no longer a separate download. Some of the fixes in this version of the Entity Framework include support for SQL Server 2008 and improved support for iterative development (the "Update model from database" wizard).
3. Inclusion of ADO.NET Data Service Framework (Astoria)
4. Improvements to DataContracts in WCF. The serializer now supports types that aren't annotated with any serialization attributes and better support for object references (and circular references) in DataContracts.

Update: the MSDN Library for Visual Studio 2008 SP1 is also available for download.