Updated to t1hilo Centos 6.x on 6/2012 
Date: 2012/06/22

My notes on the upgrade.
Update contain new kernel release: from 2.6.32-220.17.1.el6.i686 
                                     to 2.6.32-220.23.1.el6.i686.

Includes kernel update, so need to reinstall X and pmac.o.

1. Yum update.

   # yum update

2. Modify /etc/inittab to not boot into X. (runlevel 3 instead of 5)
   Disable loading of pmac.ko module in /etc/rc.local
   Reboot. (must kill X to install graphic driver).

3. re-Install the NVIDIA driver.
   (just reinstall the the lasted downloaded version).

   # cd /home/tcs3/public_html/tcs3/computers/linux/1205_nvidia 
   # sh NVIDIA-Linux-x86-295.40.run 

4. TCS

  New kernel require new .ko module -> reinstall tcs3 or module in /home/to/current/.
  Restore /etc/rc.d/rc.local to load pmac.ko.
  Recompile and test tcs3 main,  as tcs3: 
     > cd to last version
     > make clean 
     > make
     # make main-install
     # make client-install

5. final setup

   Restore /etc/rc.d/rc.local to load pmac driver
   Restore /etc/inittab to boot into X.
   reboot
   start tcs3