We are working on this. I will post a different tutorial as soon as I'm done working on it.
I would ask all of you who have already worked on jBPM to send me any interesting process definitions/use cases and the code if possible - I will be incorporating these into the manual.
A quick start is needed.
But, if you dig into the source code under jbpm.test, you will see a ton of examples.
It even has one to one matching examples of how you would implement different workflow examples from this popular workflow pattern site:
thanks for the tip on looking at jbpm.test, I hadn't seen that one before.
Please take a look at this getting started wiki I have just posted. It goes through the sample web app, creating your own process, and deploying it.