If you happen to find the full redistributable .EXE be sure to post a comment.
Looking to buy a new AMD Athlon processor? Thinking of overclocking it? Then reading [URL=http://lowyat.isentral.com/guides/athlonxp/]this article[/URL] before you buy yours might help you to find an ACE that will overclock like crazy, or so I've heard ;).
Thomas here editing this story now, [URL=http://microsoft.com/windows/directx/downloads/drx90.asp]this link contains the DirectX 9 Redistributable[/URL] (Though this doesn't contain DirectX 9.0a runtime yet) should you wish to install on multiple PCs.
UPDATE: Seems MS has decided to pull DX9.0A... Though it will probably soon be available again...