You might also look at cpan2rpm (http://sourceforge.net/projects/cpan2rpm/). I thought it was also available from one of the RH sources, but I don't see it (recently upgraded my systems).
Comment on Re: RFC: Installing perl on CentOS/RedHat
Cpan2rpm is available as part of the distro and is just a 'yum install cpan2rpm' away. Actually, if you are using EPEL, then cpanspec is just a 'yum install cpanspec' away also.
IIRC, I found out about cpanspec from a Dave Cross presentation (http://www.slideshare.net/davorg/perl-in-rpmland-presentation) and have come to prefer it over cpan2rpm.