Also refer to JBoss in Action by Jamae, Javid, and Johnson, Peter (Manning, 2009).
http://docs.jboss.org/jbossesb/docs/4.9/javadoc
http://docs.jboss.org/jbossesb/docs/4.10/manuals/html/Programmers_Guide/
http://www.enterpriseintegrationpatterns.com
http://www.dzone.com/links/outofthebox_soa_without_the_twinturbine_engine.html