My technical article regarding integration between Human Workflow Services (HWS) and InfoPath has been posted to MSDN. You can take advantage of features in InfoPath SP1 to integrate HWS, which is part of BizTalk Server 2004, with your forms to create workflow solutions. This article has tips for developing a BizTalk orchestration when InfoPath is the target client application, and it also identifies some best practices for designing an InfoPath form solution around HWS.