From FireUser.com:

The first official driver release with the full support for OpenGL 3.0 on Radeon HD 2400 and above is built into ATI Catalyst Release 9.1, set for public consumption on January 28, 2009. It will be available for download on the AMD Support & Drivers page. This release will enable full and forward-looking GL3.0 contexts on Windows XP, Windows Vista, and Linux.