in CVS.... The components used are in the jbpm4jsf part of the jbpm.3 project
Yes it's quite possible. I'm busy creating my own JSP webapp, using AppFuse and the JBPM 3.2.1 libraries. Looking at the jbpm-console source code, the JBPM tutorials, various JBoss wiki pages and help from these forums, it's coming on quite nicely.
As Ronald mentioned, you can get the source code from CVS.
A previous thread (from when I started) should help you get the source: