My previous kernel was on Fedora 13. X will not start for me on the latest kernel as the Nvidia driver would not load and RPM fusion did not have an updated driver last I checked. I don't mind waiting for an update rather than using one of the other methods of acquiring the driver. Other than a minor KDE issue, so far so good.
My current Kernel is: 2.6.34.7-56.fc13.x86_64
And it is using: kmod-nvidia-2.6.34.7-56.fc13.x86_64-256.53-1.fc13.4.x86_64
$ X -version
X.Org X Server 1.9.0
Release Date: 2010-08-20
X Protocol Version 11, Revision 0
Build Operating System: x86-06 2.6.32-44.1.el6.x86_64
Current Operating System: Linux 2.6.34.7-56.fc13.x86_64 #1 SMP Wed Sep 15 03:36:55 UTC 2010 x86_64
Kernel command line: ro root=/dev/md2 rhgb quiet vga=791 SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=us rdblacklist=nouveau
Build Date: 13 September 2010 05:58:20PM
Build ID: xorg-x11-server 1.9.0-9.fc14
Current version of pixman: 0.18.4
Before reporting problems, check
http://wiki.x.org
to make sure that you have the latest version.
$ sudo cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module 256.53 Fri Aug 27 20:27:48 PDT 2010
GCC version: gcc version 4.4.4 20100630 (Red Hat 4.4.4-10) (GCC)