You may already know this but the beta of .NET 3.5 SP1 and Visual Studio 2008 SP1 are out today. You can download and install the beta from here. See ScottGu's blog for some release and install notes here.
It fixes a lot of bugs and rolls up a ton of service releases, etc, but this is not your ordinary service pack. SP1 of .NET Framework 3.5 actually adds brand new functionality to the .NET Framweork. For example the ADO .NET Entity Framework and ADO.NET Data Services (formerly code-named "Astoria") both ship new with the .net 3.5 SP1.
This changes the definition of a "service pack" since we have new functionality added. Since these are new features it will not break anything old and it is ok to install over your current 3.5 installation. But we really have .NET Framework 3.75. Download and enjoy.
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