Shortly after the Khronos Group announced OpenGL 4.0, the newest version of the multi-platform graphics API, AMD (or ATi, whichever you like) whipped out a Preview driver that supposedly supports it.
As usual, the driver is intended for the ATI Radeon, FireGL, FirePro, and Mobility Radeon graphics accelerators, and it’s available for Windows XP, Vista, 7 and Linux.
With it’s latest revision, OpenGL 4.0 is comparable to DirectX11 and has one major advantage – it runs on Windows XP!
You can download the driver here.