I just made my first attempt to use the RadeonHD driver on my Thinkpad. It failed :-) Failed in that X starts without complaining but then I see lots of green and red pixels on black ground instead of GDM.
But maybe somebody can help me figure out what's wrong? I will attach my Xorg.log and xorg.conf.
Get the files here: http://www.nbi.dk/~hunziker/xorg-files.tar.bz2