How to do workflow in BizTalk and what happens to HWS
posted a very interesting document
about choosing a workflow approach with BizTalk.
I was particularly surprised with the statement that HWS (Human Workflow Services) will not be extended or enhanced and ultimately removed from BizTalk (not in the next version, though). HWS will be replaced by the workflow tools that will be natively build into Longhorn. That's a major consideration when you think about HWS as a option in your architecture.