I encountered some problems when I tried to play some of the freeware games on the site with my Fedora.. Well, problems weren't caused by the games though =)
Symptoms were that whenever I tried to play a game which had decent graphics, my computer turned out to be slow as a snail...
Problem was that my ATI-RADEON card was not working well. (I have radeon 9600). Or actually direct rendering was not working.
If you experience similar problems, you can try out command
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glxinfo | grep "rendering"
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direct rendering: Yes
If it is
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direct rendering: No
Anyways, what I did was following:
I installed kmod-fglrx packaga (lernel module) with yum-installer from Livna repository. I have heard that if nVida drivers are installed, they must be removed before installing ati drivers.
(I believe I have some instructions/explanations about yum somewhere in here...)
Beware. This is also likely to update your kernel version, if you do not already have newest kernel... And in that case, other kernel modules (like support for mounting ntfs partitions) may not work.. Anyways, if you use Grub boot loader, I believe that yum automatically creates new entry for booting the new kernel in boot menu, and leaves the old kernel to be selectable too. Anyways, I will not give any guarantees, so proceed with your own risk. NOTE: If the kernel is updated, then you need to boot on it before going any further.
Installation and rest of the things must be done as root user.
Then I gave command
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setsebool -P allow_execmod=1

Then the ati-radeon driver must be enabled... In order to do so you must shut down X-windowing system. It can be done by changing to init state 3 with command
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init 3
Command to enable new driver is
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ati-fglrx-config-display enable
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init 5
I have heard that with Intell motherboards you need to change your x.org configuration file as follows (I do not have intell's mobo, so previous steps did the trick for me)
open /etc/X11/xorg.conf file with your favourite text editor (vim is the only real editor though

Find line
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Driver "fglrx"
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Option "UseInternalAGPGART" "no"