Some great external material is starting to appear around the web now for Drools 4.0
Does your bad Java code need help? (from Rules and Flow) (Paul Browne)
Gives an intro into the new rule flow stuff using the Number Guess example.
Deploying JBoss Drools BRMS on Weblogic (Paul Browne)
Details how to get Drools setup and running on Weblogic
Banking on DROOLS - Part 1 (John Dunning)
Detailed step by step tutorial on using Drools to solve simple bank account management problems.