After introducing "Java Web Services 2.0" at http://weblogs.java.net/blog/iasandcb/archive/2006/03/java_web_servic.html, I made up my mind to broaden the notion :-)

First of all, I felt I had to revise JWS 2.0 because JAX-WS 2.1 and WSIT came up. JWS 2.0 is a set of:

SAAJ 1.3
JAXB 2.1 + JAX-WS 2.1
WSIT

Secondly, .NET Web Services 2.0 is WCF in .NET framework 3.0. Thirdly, Interoperability 2.0 is shown by Sun and Microsoft via WSIT and WCF.

Finally, Web Services 2.0 is a combination of:

JWS 2.0
NWS 2.0
Interop 2.0

OK, as Vista and Mustang (Java SE 6) comes into the final stage, we will be happily able to enjoy WS 2.0 with MTOM, WS-*, and ease of development and use.