How to remove unused Kernels in Fedora/Centos/Redhat Linux

I have a Fedora 16 system . Through kernel updates now I have several Kernel options when I boot the machine.  So thought of removing old kernels.I like to keep the boot process clean.
there are few way to remove the kernels that are no longer current.  the process is fairly simple,

To remove it , run as root

# rpm -e kernel-version

in a terminal (Main Menu > System Tools > Terminal) where version is the full release number. Enter

# rpm -q  kernel

to get the installed kernels.

or

Run this command as root/super user,

# package-cleanup –oldkernels

After loading packages you will be promoting to enter an option,as below…

Dependencies Resolved

=======================================================================================================================================================================
Package                                           Arch                         Version                                        Repository                         Size
=======================================================================================================================================================================
Removing:
kernel                                            i686                         3.1.5-2.fc16                                   @updates                           92 M
kernel-devel                                      i686                         3.1.5-2.fc16                                   @updates                           26 M
Removing for dependencies:
kmod-wl-3.1.5-2.fc16.i686                         i686                         5.100.82.112-1.fc16.5                          installed                         2.5 M

Transaction Summary
=======================================================================================================================================================================
Remove        3 Packages

Installed size: 121 M
Is this ok [y/N]: y
Downloading Packages:
Running Transaction Check
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Erasing    : kmod-wl-3.1.5-2.fc16.i686-5.100.82.112-1.fc16.5.i686                                                                                                1/3
Erasing    : kernel-3.1.5-2.fc16.i686                                                                                                                            2/3
Erasing    : kernel-devel-3.1.5-2.fc16.i686                                                                                                                      3/3

Removed:
kernel.i686 0:3.1.5-2.fc16                                                      kernel-devel.i686 0:3.1.5-2.fc16

Dependency Removed:
kmod-wl-3.1.5-2.fc16.i686.i686 0:5.100.82.112-1.fc16.5

Complete!

Thats it. you have removed your old/unused kernels.