CentOS is a free version RedHat Enterprise -- essentially just the Logos replaced.
I am running CentOS 5.4 (the latest out). Version 5.0 was released in March 2007,
they stick to the same version of things throughout releases. Version 6 is
rumoured to be out in Q1 next year.
I can't find someone who is offering php 5.2 (or 5.3) for this platform.
PHP 5.2 is in the c5-testing repo, you just have to enable that in your /etc/yum.repos.d files.
PHP 5.3 for CentOS is here:
http://rpms.famillecollet.com/el5.i386/
--
Del
Babel Com Australia
http://www.babel.com.au/
ph: 02 9966 9476
fax: 02 9906 2864