Are you aware there is a BizTalk Server Dev Center?? 

Have a look http://msdn.microsoft.com/en-us/biztalk/default.aspx

There is some very Nice Biztalk 2009 documentation here which is well worth the effort, as the 2009 release is out, you should now know that you need to do BizTalk the right way.

Have a look Below:

BizTalk Server 2009 Installation and Upgrade Guides

BizTalk Server 2009 Code Samples 

BizTalk Server 2009 Documentation