If you’ve got CRM 3.0 here the Microsoft’s BizTalk 2006 Adapter for you.
There have been whispers about this for a while…..wait no longer 
Grab it here – http://www.microsoft.com/downloads/details.aspx?familyid=4628FCA6-388D-45BC-A154-453B920DBCB8&mg_id=10044&displaylang=en