To follow up...
Thanks for the pointer. I was able to take these instructions for 3.1 and make them work for 3.0.2.
For those who haven't done it yet, the quick answer is:
1) download and install the jBPM-db kit
2) create a datasource file
3) modify the jboss-service.xml file
4) modify files in the jbpm.sar.cfg.jar file.
5) restart your server
In retrospect, pretty straight forward.