schaplain, visit freshrpms.net and install the nVidia RPM.
# rpm -ihv http://ftp.freshrpms.net/pub/freshrpms/fedora/linux/6/freshrpms-release/freshrpms-release-1.1-1.fc.noarch.rpm
# yum install nvidia-x11-drv
After you install the package, load the "Display" configuration program and change your hardware device from "nv" to "nvidia" and log out and log back in. Should take 5 minutes to get you up and running.