My colleague Michael Washam posted a nice article about how to call a WCF web service from a SharePoint Web Part using Javascript. How to call a WCF web service from SharePoint .
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Just posted today: http://msdn2.microsoft.com/en-us/library/bb266709.aspx This new article and sample provide a great demo and example code for using WF and WCF together for building workflow-enabled services. It is a rebuild of an Expense Reporting demo
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