[CentOS] Cleaning up smp kernels

I have used the package-cleanup utility to remove old kernel packages, but I noticed that it only removes the 'kernel' and 'kernel-devel' packages. It does not touch 'kernel-smp', 'kernel-hugemem', etc. What is the recommended method of cleaning up these other kernel packages? Should I just 'yum remove' the ones I don't need?

Some of my servers have a few piling up...

# rpm -q kernel-smp kernel-smp-2.6.9-34.EL kernel-smp-2.6.9-34.0.1.EL kernel-smp-2.6.9-34.0.2.EL kernel-smp-2.6.9-42.0.2.EL kernel-smp-2.6.9-42.0.3.EL kernel-smp-2.6.9-55.0.2.EL kernel-smp-2.6.9-55.0.6.EL kernel-smp-2.6.9-67.0.1.EL kernel-smp-2.6.9-67.0.15.EL kernel-smp-2.6.9-67.0.20.EL

-- Bowie