Note that this now only works for the 64 bit version of CentOS
useful link: http://itscblog.tamu.edu/startup-guide-for-kvm-on-centos-6/
yum groupinstall "Virtualization*"
yum install dejavu-lgc-sans-fonts
echo "BRIDGE=br0">> /etc/sysconfig/network-scripts/ifcfg-eth0
#now check it looks ok:
vi /etc/sysconfig/network-scripts/ifcfg-eth0