The OpsMgr 2007 MP for BizTalk Server 2006 and BizTalk Server 2006 R2 has been released to the MP Catalog on 4/14/2008 (version 6.0.6278.16).  This management pack is a complete re-write of the BizTalk Server management pack, which takes full advantage of the Operations Manager 2007 feature set for monitoring BizTalk 2006 and 2006 R2 servers and applications.  There is also an additional management pack devoted specifically to RFID.  For more details on the functionality of the management pack, download and install the MP package and review the MP guide.