sample from this link:
http://blogs.amd.com/developer/2010/07/26/opengl-es-2-0-coming-to-a-desktop-near-you/comment-page-1/#comments
doesn't work on Catalyst 11.8 on my 6950 (Crosfire and one card), it just shows white window filled with window HBRUSH color, no any drawing, and don't show any error via (e)glError.