I found this video in the pdc 09 site. this video demonstrated some interesting BizTalk 2010 and WF4 features. so I store it here to avoid forget the URL, and also share with you.
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Learn how BizTalk Server 2009 lets you focus on writing the code to do the hardcore business logic and let BizTalk take care of moving the data. Hear how your development skills with Windows Communication Foundation (WCF), and Windows Workflow Foundation (WF) work seamlessly with the powerful integration platform of BizTalk. Find out how BizTalk aligns with the Microsoft application server in the longer term.