This week Microsoft released DirectX 9.0a. Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. The DirectX 9.0a release includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX 9.0 APIs. This release also resolves an issue with DirectX 9.0 where some multiplayer games or MSN Messenger may not work correctly. A number of minor bugs were also resolved.
DirectX 9.0a supports Windows 2000, Windows 98, Windows ME, Windows XP. The DirectX 9.0 runtime cannot be uninstalled. We recommend Windows Millennium and Windows XP users create a "System Restore point" before installing.
The End-User Runtime is available in 15 languages here. If you want to redistribute DirectX 9 through your network, you can download the full Redist version (32 MB). The Software Development Kit (SDK) is a whopping 227 MB, and located here (9.0 version. No sign of a 9.0a SDK yet).