ATI have just release a new official version of their Calayst drivers for ATI Radeon cards. There is support for Windows 98, Me, 2000 and XP
Product
Download: Catalyst 3.1 drivers for Windows 2000 / XP
Download: Catalyst drivers for Windows ME and Windows 98 / 98SE
Additionally, they have also released the new ATI Control Panel to go with these drivers: Version: 6.14.10.4019
Download: ATI Control Panel for all OS's (4.65mb)
News source: ieXbeta