Here are my qemu archives. I use qemu to test BartPE builds and bootable Apps (syslinux based), and play poker on FullTilt (while in Centos). For now I don't use a hypervisor, like kvm, but I do use the kqemu module. You can get the qemu/dkms-kqemu packages at rpmforge. If your machine supports VM in hardware, then use the kqemu module or the kvm hypervisor. centos-virt@centos.org can support Xen, qemu, kvm, etc in Centos.