I have just published a new mini-White Paper- Why Xen? to the Xen.org website. Please take a look and let me know of any changes you would like to see. There are always room for improvements so let me know what you would like added or changed. I anticipate putting out more information on the Xen hypervisor and why customers should choose it over the next few weeks in a variety of formats: presentations, brochures, etc.