JAX-WS and .Net interoperability
Sun plans to implement the WS-* specifications that will greatly improve interoperability with .Net and the Windows Communication Framework (WCF/Indigo). The implementation of these specifications will be built on top of JAX-WS.
You can read the press release from Sun about this at:
JAX-WS has been feature complete for a couple of months now and is becoming very stable. You can download the specification, APIs and JavaDocs for JAX-WS
here. You can download the nightly builds of the JAX-WS RI here.