I have updated the Xen.org site and created a new Xen Summit Boston page: http://www.xen.org/xensummit/xensummit_summer_2008.html
I am still collecting presentation slides and converting them to pdf so not everything is live yet. I will also be adding the videos of the presentations shortly but I need a bit more bandwitdh to make that happen so that will update over time.
Also, check out the cool new logo for the Xen Summit Tokyo (Asia) sponosored by Fujitsu on the main Xen Summit page.