For those that like to keep everything up to date Microsoft has released the DirectX End-User Runtimes (February 2010). The web installer can be found here, http://www.microsoft.com/downloads/d...displaylang=en
and will only update those files that need it or are missing. The full redistributable package is here, Download details: DirectX Redist (February 2010)
This contains all DirectX 9/10/11 files (which get installed/updated depend on OS), but will also only update those that need it or are missing. Also good on a clean Windows install of Windows for adding DirectX 9 and 10 files for those games that need it.