Many people want to know what WSIT is. WSIT (Web Services Interoperability Technology - aka Project Tango) is Sun's implementation of WS-* specifications that enable interoperability with Microsoft's WCF (Windows Communications Foundation). To learn more you can see my (and Nick Kassem's) JavaOne slides. Also, I wrote an overview of Sun's Project Tango for SDN that gives a good summary of the functionality enabled by WSIT. Please give them a read and try WSIT and let us know what other information you need and your use cases so we can be sure they are covered.