You may have noticed that you can use the Eclipse GPD plugin to generate XHTML fragments, which can then be shown by the jPBM web console -- and then wonder how to get started yourself. Maybe there's some examples in the jBPM Suite (starters kit) that do not rely on the web console, but I feel that better real-life examples are given in the JBoss Seam downloads.
You could EASILY give Seam a try as it is up & running REALLY fast.
See http://labs.jboss.com/portal/jbossseam/gettingstarted but use the JEMS 1.2.0.GA installer (found here, and giving you JBoss AS 4.0.5.GA). Next, when AS is up & running then download Seam, unzip it, adjust the build.properties file (ignore the Tomcat settings) and just run "ant deploy" for any of the jBPM examples, being "todo" and "dvdstore" (online demo at http://dvdstore.demo.jboss.com/ ).
For these examples you'll see that the deployed EAR includes the jBPM 1.3.4 JAR, which is included in Seam. Enjoy!