This download provides the DirectX end-user multi-languaged redistributable that developers can include with their product. The redistributable license agreement covers the terms under which developers may use the Redistributable. For full details please review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory.
Download: DX End-User Runtimes (April 2006)

Are these monthly updates really necessary? What do they add? or change?
games which were made with updated SDK versions, need those updated DLL files. (d3dx9_xx.dll)
in this april update, d3dx9_30.dll is new.
Your GAME ships with everything you need. Only game WRITERS need this.
# The DirectX redist installation includes all the latest and previous released DirectX runtime. This includes the bi-monthly D3DX, XInput, and Managed DirectX components.
# The DirectX runtime cannot be uninstalled. We recommend Windows Me and Windows XP users create a "System Restore" point before installing.
It's the latest and greatest DirectX 9.0c fully updated. 52MBs in size. Read warnings as there is no uninstall for this software.
I problably wont download it seeing as I dont play too much games.
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