I am a learn by example, learn by demonstration kind of guy. I prefer to see the technology running before I'm willing to invest time into downloading it, reading the documentation and trying it out.
Here is a Flash-based recording of JBoss ESB + jBPM. This is your best starting point if you only have 17 minutes for an immersion into SOA the JBoss way. This demo includes the Spring AOP trick of "eavesdropping" (aka wiretap) on the JPetstore so that the order is routed through the ESB and into a jBPM process which orchestrates the services & manages the human tasks.
jBPM and ESB 4.2 Demo: http://www.redhat.com/v/webcast/SOAdemo2/SOADemo2.html
I'll make an effort to record more demonstrations of JBoss ESB quickstarts & examples in the future. For more information on JBoss ESB, please visit: www.jboss.org/jbossesb