Looks like you are using NVIDIA's proprietary display driver:
xorg-x11-drv-nvidia-260.19.12-3.fc14.src.rpm
is that what your Xorg.0.log says you are using?
>> On Mit, 2010-11-17 at 13:59 -0500, Mathew Hennessy wrote:
>>> Hi,
>>> I'm getting periodic Xorg segfaults after upgrading from FC13 to FC14
>>> on i686.. Here's what it left as a backtrace in Xorg.0.log.old:
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