JBoss AS 4.2 was released on May 11 this month and includes many key features from Java EE 5, such as EJB3.0, JSP 2.1 and Servlet 2.5.
JBoss AS 5.0 will be the complete EE 5 implementation, but 4.2 has been made available to get these features out now, rather than waiting for 5.0 to be completed.