Although not healthcare specific, it's still worth checking out the new BizTalk Server 2006 Developer's Troubleshooting Guide published on the BizTalk Server Developer Center.
Anyone doing any serious BizTalk development with HL7 v2, v3 and other healthcare standards (HIPAA, CDISC, ASTM CCR, HL7 CDA...) will benefit from the paper. Go get it. Now. Seriously.