Visual Studio SP1 is out! Pay a visit to the download centre to take a look.
Here are a couple of notes from the page there:
This download installs Visual Studio 2008 SP1 Beta. Visual Studio 2008 SP1 includes support for SQL Server 2008, new ADO.NET features such as the Entity Framework, improvements to the WPF designers, WCF templates for Silverlight projects, debugger support for the .NET Framework public symbols and source release, control improvements such as the DataRepeater for Windows Forms and Office 2007 Ribbons for C++, and several general updates for debugging and IntelliSense. SP1 also enhances the stability, performance, and security of many features.The included .NET Framework 3.5 Service Pack 1 adds many new features and fixes, including the following: