Fedora 9 is having issues with Nvidia support because they employed a beta version of xorg which nvidia will not support until it becomes stable which should be in a short time. you have two solutions. Downgrade xorg or Use fedora 8 until the xorg issue is addressed I have chose to downgrade and wait for xorg to become a stable version so nvidia will support it.
-update-
They have fixed Nvidia for Fedora 9 5/29/2008
*personal recommendation just use fedora 8 until support comes for nvidia on fedora 9.
for installation of drivers go to the home page of livna and install the repository
go to terminal mode and go to Super User mode and type
yum install kmod-nvidia.
-----Update----
5/29/2008
Nvidia problem has been fixed
just go to http://rpm.livna.org/rlowiki/
and select fedora 9 repository and install
go to terminal and type su (press enter)
type your ROOT password (not user)
(press enter)
yum install kmod-nvidia (press enter)