Glassfish is the only
java EE 5 application server for now,
but
JBoss support
EJB 3 ,
www.jboss.com OC4J 10.1.3.1.0 preview support EJB 3 ,http://www.oracle.com/technology/software/products/oc4j/
EasyBean from JOnAS people support EJB3 ,
http://jonas.objectweb.org/ WebSphere has a tech preview for EJB3 , i do not know the link
caucho resin has some ejb3 support:
http://www.caucho.com/resin-3.0/ejb3/index.xtp