ATi are the first graphics manufacturer to release their own set of DX9 compliant Catalyst graphics card drivers for Windows XP and 2000 users. Please remember these drivers are still in BETA, so use them at your own risk!
On the same page, you'll also find a collection of demos optimised for DX9 with Radeon 9700 and 9500 cards.
CATALYST™ DX9 BRC0 display drivers are to be used in conjuction with Microsoft's DirectX9 Release Candidate (RC). This driver is currently a Beta Release Candidate (BRC) and is being provided to permit users to experience the most advanced graphics capabilities available. Please keep in mind that this driver is a Beta Release Candidate and may have outstanding bugs at present (Please refer to the errrata notes for known issues).More information @ ATi
ATI does NOT recommend installing these drivers in systems used for mission critical operations or where productivity of any kind is a concern. There is a chance that using any Beta Release Candidate software may result in an unstable system.