Marty and Scott have an article in this month's MSDN Magazine, "8 Tips and Tricks For Better BizTalk Programming". Each tip (I am not giving any away) is reinforced with useful details and examples. The article also includes a short list of resources...

BizTalk Server 2006 R2 Beta 2 is now available from the Microsoft Connect Site. If you are not a member of the BizTalk Server 2006 R2 connect community, you can still get a copy of the beta through the Microsoft Connect Site, but it takes some persistence...