According to Pablo Galiano VSSDK Assist December 2007 CTP is out and available for download.
The features are (from here):
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Compatible with Visual Studio 2008 RTM and Visual Studio 2008 SDK 1.0
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Support for CSharp and Vbasic code generation
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VS package Setup project added (wix based)
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Flavor project creation
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Custom project creation
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BitmapStrip creation
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Extenders creation
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Solution extenders
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Project extenders
Download page