MSDN
MSDN VS - The source,
the difference is obvious - homepage -- VS commercials
Visual Studio Team System
VSTS Visual Studio Team System feature overview
Visual Studio Tools for Office
VSTO - Visual Studio Tools for Office
Visual Studio promotions / tutorials
Overview VS- what's new in Visual studio (.pdf file 21 MB)
Dig deep - into Visual Studio 2005
LearnVS
VS code swap (also snippets)
CodeKeep: snippets and VS addon, MS VS code snippets
C# key bindings - an overview (.pdf)
VS How do I - videos series