Just found this paper: Most Commonly Used Methods in ADF Business Components by Steve Muench (15 March 2005) on OTN. This paper provides a high-level description of the key ADF Business Components classes in the Oracle Application Development Framework, summarizing the methods that ADF developers write, call, and override most frequently.
The introduction to many commonly used ADF BC methods and the indication of what they provide a hook for is very useful when you are working on ADF BC projects.
The paper Business Rules in BC4J (revised August 2002) is useful complement to this paper.