Win32 to .NET API Map
Those of us coming from a background in ASP and Visual Basic have been hamstrung a bit with the .NET Framework because most of us don't have much experience with the Win32 API, and therefore didnt understand what functions each class or namespace was wrapping within the OS. Its one of the reasons I believe that many C++ programmers (esp. MFC) have seemed to have a leg-up on the rest of us.
Based upon their latest MSDN article, Microsoft must have finally recognized this. The latest MSDN posting "Microsoft Win32 to Microsoft .NET Framework API Map" is a much appreciated contribution, that I only wish was available a year or two ago.