everything is pretty simple when you know how. the problem only occurs when you dont know how. well with this howto, you will know how to install drush5.7 onto a centos6.3 box
yum -y install php-pear
pear upgrade
pear channel-discover pear.drush.org
pear install drush/drush
nothing to it. i wont tell you about the one hour i spent searching for it.
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fedora & RHEL
the same holds for fedora and redhat (RHEL) distributions
one liner
now you can use this one liner to install drush and always keep it updated