Hi, did you try with the examples and slides published here:
http://salaboy.wordpress.com/2011/01/24/announcing-jbpm5-community-training/
I'm trying to publish the human task module soon. do you have concrete questions about it?
Check the sample code here:
https://github.com/Salaboy/Drools_jBPM5-Training-Examples
Greetings.