The slides from the TechNet Monthly session What's New in BizTalk Server 2006 can now be downloaded from http://download.microsoft.com/download/a/6/c/a6c4a976-da3e-4950-8c46-c3964cbbec1f/TechNetMonthly-WhatsNewBTS2006.ppt, which should have some more bandwidth than my own site.