XEN

Links
http://wiki.univention.de/index.php?title=Installing-signed-GPLPV-drivers - Installing-signed-GPLPV-drivers
http://www.pug.org/index.php/Xen-Installation - Xen installation manual on PUG [German]
http://man.cx/xen-create-image - Manpage for xen-create-image
http://wiki.xensource.com/xenwiki/ - http://wiki.xensource.com/xenwiki/
http://wiki.debian.org/Xen
http://www.neobiker.de/wiki/index.php?title=Debian_XEN_Installation
http://xen-tools.org/software/xen-tools/
http://wiki.xensource.com/xenwiki/XenNetworking
http://www.xen-support.com/
http://packages.ubuntu.com/hardy/linux-image-2.6.24-23-xen - Ubuntu dom0 kernel
http://www.xenserver5.com/videos/Getting_Started_with_XenServer/Getting_Started_with_XenServer.htm - Citrix XenServer HowTo video
http://code.google.com/p/ganeti/ - ???
http://www.virtuatopia.com/index.php/Creating_and_Booting_a_Xen_Guest_domainU_using_an_NFS_Mounted_Root_Filesystem
http://www.xen.org/products/cloudxen.html - Windows driver
http://code.google.com/p/gentoo-xen-kernel/downloads/list - Xen dom0 kernel ebuilds using rebased Opensuse xen-patches
http://bderzhavets.wordpress.com/ - Xen Virtualization on Linux and Solaris Blog
http://code.google.com/p/spice4xen/ - SPICE support for Xen

Check CPU support for full virtualizon

egrep -c 'vmx|svm' /proc/cpuinfo

If the output are bigger then 0 your CPU supports full virtualizon so you can run Windows or other unmodified OS under XEN or KVM.

direct device access

disk=['phy:/dev/sdb2,hda,w','phy:/dev/cdrom,hdc:cdrom,r']

List memory usage by VM

for HOST in $(xm list  | cut -d" " -f1 | grep -v Name | grep -v Domain-0); do
    echo ${HOST}
    ssh ${HOST} LANG=en free -m | head -2
    echo
done

ntpdate

livecd