No go with 9.1 for me, Fedora 10 just boots to a black screen and no further.
8.12 was working OK with just a minor change of:
sudo ln -s /usr/lib64/dri/fglrx_dri.so /usr/lib/dri/fglrx_dri.so
I've had to roll back to 8.12 until I get time to look into the Xorg logs in detail.
Fedora 10, 22.214.171.124-159.fc10.x86_64, 8GB
ATI Radeon HD 4870 X2 (2GB)