EVERY BizTalker should join this Group.
A post on Scott WoodGate's Blog pointed to a sharepoint site. Join this group. To read the document you must join the group. I urge every Biztalker to do so. There are some pretty good documents in there.
The docuemnt I first interested in was BizTalk Server 2006 Adapter Enhancements.doc but then I saw bizTalk-2004-reviewers-guide.doc could be intereseting and the document BizTalk Server 2006 Setup and Migration.doc would definitely be interesting.
So there is a lot to read and learn there, that's why i think every BizTalker should join the site.....