In my case basic OS CentOS 5.4 x86_64 was used.
Browse to http://www.gitco.de/repo/ and grab the needed repo file for your arch and put it into /etc/yum.repos.d. (in this case x86_64).
In case a repo file you need doesn't exist but the folder with this version exists on this repository, then you may simply download any of repo files and change its entry.
Suppose you need to install XEN ...
1) Change shell location:
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cd /etc/yum.repos.d/
2) Download, for example GITCO-XEN3.4.1_x86_64.repo:
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wget http://www.gitco.de/repo/GITCO-XEN3.4.1_x86_64.repo
3) Edit this file from:
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[gitco-xen3.4.1]
name=RHEL/CentOS-$releasever - GITCO XEN3.4.1
baseurl=http://www.gitco.de/repo/xen3.4.1
gpgcheck=0
enabled=1
to
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[gitco-xen3.4.3]
name=RHEL/CentOS-$releasever - GITCO XEN3.4.3
baseurl=http://www.gitco.de/repo/xen3.4.3
gpgcheck=0
enabled=1
4) Save the file.
5) Run:
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yum groupinstall Virtualization
6) Edit /boot/grub/grub.conf to reflect the correct default Kernel (in its name it should have xen)
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# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/sda1
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.3.1.el5xen)
root (hd0,0)
kernel /boot/xen.gz-3.3.2 dom0_mem=1024m
module /boot/vmlinuz-2.6.18-194.3.1.el5xen ro max_loop=255 root=LABEL=/
module /boot/initrd-2.6.18-194.3.1.el5xen.img
title CentOS (2.6.18-194.3.1.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-194.3.1.el5 ro root=LABEL=/
initrd /boot/initrd-2.6.18-194.3.1.el5.img
7) Reboot.
