Before JAX-WS JSR had been implemented by the java application servers, developers used to refer two technologies to build up their web services, AXIS and JWSDP.
I have my own experience about those two.

Now just like simplified EJB 3, JAX-WS has been discovered as a perfect material in Java EE. You can find diffrenet kinds of implementations for JAX-WS: JWSDP, AXIS 2, JBoss WS, ....

Websphere also supports JAX-WS try this link:
publib.boulder.ibm.com/.../cjaxwsruntime.html