OFBiz Framework Introduction Videos (sponsored by HotWax Media)
1:Introduction to OFBiz (3:03)
2:OFBiz Framework Overview (7:24)
3: Artifact Reference Diagram Overview (20:56)
4: Example Application Design Overview (12:43)
5: Entity Definitions (8:46)
6: Service Definitions and Implementations (15:40)
7: UI Artifacts: Request, View, Screen, Form (20:43)
8: File Details following Artifact Reference Diagram (12:22)
9: Doing Some Simple Changes (8:31)
A: Where to go next? (3:17)

https://cwiki.apache.org/confluence/display/OFBTECH/Framework+Introduction+Videos+and+Diagrams