If you don’t already know Todd Deshane and the work he and his colleagues have done at Clarkson University for the Xen project, take the time to check out his profile at http://www.xen.org/community/spotlight/deshane.html. Todd is very active in the community and has submitted assistance on the Xen mailing lists for over 665 questions. He has also been a leader in the community in building and teaching Xen for USENIX Xen training classes.
Todd has also presented at Xen Summit’s with his last presentation at Xen Summit Boston in June last year; http://www.xen.org/files/xensummitboston08/Deshane-XenSummit08-Slides.pdf.
Make sure you get in touch with Todd to learn even more about his virtualization PhD research and get answers to your most sophisticated Xen hypervisor questions.