In Seam 2.0, the support for Web Services is primarily just allowing you to use a Seam component as a Web Service endpoint by combining Seam annotations with JAX-WS anotations and, as Jason mentioned, for stateful web services (which is kind of an edge case for most people in the beginning). There is no support for the client of the Web Service in Seam. Effectively, Seam "punts" on that for now. This is one area where I say that
you should use the Seam-Spring integration.
The RESTeasy integration is a very exciting part of Seam 2.1 and will eliminate the pain of using all of that XML cruft that comes along with Web Services.