Thanks for catching that, we've updated the release notes:
The dxsdkver.h file that ships in the March 2008 DirectX SDK has incorrect version numbers. This should have little impact however developers needing to use this file should modify it so that the #define statements have the following values:
#define _DXSDK_PRODUCT_MAJOR 9
#define _DXSDK_PRODUCT_MINOR 22
#define _DXSDK_BUILD_MAJOR 1284
#define _DXSDK_BUILD_MINOR 0000
XNA Evangelist Dude.
http://letskilldave.com
http://twitter.com/letskilldave