The DirectX 9.0 SDK Update (October 2004) is now available for download.
DirectX 9.0 SDK Update - (October 2004)
Download the complete DirectX 9.0 SDK - (October 2004), which contains the DirectX 9.0c Runtime and all DirectX software required to create DirectX 9.0 compliant applications in C/C++, and C#.
If you haven't played with DirectX SDK before, this weekend might be a good time to download it and give it a shot. Be sure to check out the Microsoft DirectX 9.0 SDK Update item that gets added to your All Programs menu in Windows. There's a DirectX Sample Browser that lets you sort the samples available, and it even copies individual projects that you might want to start with to your Visual Studio Projects folder.
You can find more DirectX information on MSDN here.
Update: Mitch Walker has more information about the changes here.