However the ELRepo repository has the kmod-reiserfs package which provides the much needed kernel modules. As such enabling ReiserFS support on RHEL/CentOS/SL 6.2 consists of adding the ELRepo repository, installing the kernel module for ReiserFS and the reiserfs-utils package which provide tools for creating and repairing ReiserFS filesystems.
The required steps are:
# rpm --import http://elrepo.org/RPM-GPG-KEY-elrepo.org
# rpm -Uvh http://elrepo.org/elrepo-release-6-4.el6.elrepo.noarch.rpm
# yum update
# yum install kmod-reiserfs reiserfs-utils
# modprobe reiserfs
Now you can have GNOME Nautilus mount ReiserFS partitions by simply clicking on the partitions and providing root's password.
It should be noted that the reiserfs-utils is also available in the CentOS-extras repository however the version on ELRepo is newer. If you have priorities associated with third party repositories take this into account.