We just published a new whitepaper that provides some specific guidance on HL7 Version 2 development with the BizTalk Accelerator.
The whitepaper deals with:
The whitepaper also provides instructions on how to configure your solutions to accomplish the steps above.
Check it out on the Microsoft Downloads web site.
[Update: the whitepaper is temporarily off-line as we review the code that was mistakenly left out of the original publication. Will update this post once it's back online.]