use RPM friend

(Centos i386)
# wget http://packages.sw.be/rpmforge-relea...l5.rf.i386.rpm

# rpm -Uvh rpmforge-release-0.5.2-2.el5.rf.i386.rpm


(Centos x86_64 el5)
# wget http://packages.sw.be/rpmforge-relea....rf.x86_64.rpm

# rpm -Uvh rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm

Done

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