Read Jorgen's interview on The Server Side about how the Interop plugfests at Microsoft are arranged. There is full section talking about WSIT and WCF interoperability towards the end of the interview. As mentioned in my previous plugfest reports (1, 2, 3), we have incrementally achieved a very good level of interoperability with Microsoft. And this is also evident (Green and Yellow is good) in the slide used at Microsoft tracking WS-* adoption in the industry.

WSIT technologies are available in GlassFish.

Technorati: Web Services GlassFish WSIT WCF