Those who got the TechEd 2008 DVDs at TechDays or DevTeach may have found that there's a glitch with the sessions browser made with a pre release version of Silverlight. Check for a workaround here:
http://blogs.msdn.com/cdndevs/archive/2008/12/12/a-quick-word-about-the-tech-ed-2008-north-america-dvds-from-techdays.aspx