At first it appeared that ATI had finally gotten it right. Drivers install fine on 2.6.20.x kernels, no problems. First install, no problems. amdccle install of course still not working, but that's irrelevant. But then on further testing, we discovered that on debian sid based systems, on driver deb uninstall, something is going wrong, this has been confirmed by two users so far.
When they start x after the reinstall (not the initial 8.36.5 install, which is fine for them) of 8.36.5, they see screen and font corruptions. symptoms include icon jaggedness, weird looking fonts on desktop.
This is just preliminary, I don't know what the real problem is that is causing something to be changed on deb uninstall, but it's something real.
Installing an older driver does not appear to resolve this issue, which suggests that either a configuration file or some other xorg component was modified. Also mouse pointer was changed to 'an ugly' one, so something really changed on uninstall. We've never seen this particular issue before by the way.
Pulling this driver until I can get this issue resolved, although users did report higher initial framerates etc, but it's not worth the damage it's doing on reinstall..
Installs running 126.96.36.199 and 188.8.131.52 kernels.