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Visual Studio 2008 Service Pack 1 is not finished yet, but we do have a beta version of the documentation ready for you to read!  You can learn about some of the features that you’ll see later this year when we release SP1. 

I recommend starting with reading about a totally new feature that we put into SP1 that allows you to extend Word documents and Excel Workbooks at runtime from an Application-Level Add-in.  Here is the link to the Beta of the documentation:

http://vs2008sp1docs.msdn.microsoft.com/en-us/ms334311.aspx

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Microsoft, Visual Studio, SP1, Beta, Documentaion