Direct3D
Alex Russell's Game Programming Tutorial usin, An Overview of Direct3D, Direct3D / DirectX Graphics Programming, DrunkenHyena Direct3D Tutorials, gfm's Direct3D Developer Zone, GraphitX Direct3D Programming, Jolt3D Engine, Two Kings Direct3D Tutorial
CDX Library Game Development Kit
A set of C++ class libraries designed to ease the use of DirectX when writing Windows games and applications.
Chilkat DirectX C++ Game Development Library
Provides a framework and C++ classes for developing DirectX applications. [Open source]
DirectX 5.0 Port for Mingw32 and Cygwin
This makes it possible to use DirectDraw with the Mingw32 or Cygwin free compiler environments.
DirectX 6.0 and Windows Media Technologies Bring M
Article about DirectX on Windows CE-based devices such as the Sega Dreamcast console.
DirectX eXperience
DirectX site with articles, tips & tricks, and a list of related books.
Games Programming with DirectX 8 and C++
Help programmers who are new to DirectX get acquainted with the libraries, in particular DirectDraw and DirectInput.
Inside DirectX
Microsoft's authoritive book written by partners on the DirectX team contains many essential details for DirectDraw programming.
Microsoft DirectX Developer Center
Microsoft's official home site about DirectX.
Mr.Snow DirectX8 Column Gold
DirectX programming tutorial collection. [Commercial and free versions]
The Code Project
A programming site with a large section on DirectX. Includes articles, and links.
TripleBuffer Software
Contains DirectX tutorials, source code, and projects for both C++ and C#.