The upcoming (october 2008 version) Catalyst graphics driver is available in BETA version. You can download the huge archive (~200Mb) here:
– Catalyst 8.10 BETA for Vista
– Catalyst 8.10 BETA for XP

As soon as the WHQL version is available, I will publish the OpenGL extensions because GPU Caps Viewer told me that Cat8.10 has around 115 extensions…

Here are the screenshots of my Radeon HD 4850 and Catalyst 8.10 BETA under XP32: