Several of the Oracle ACEs that work intensively with ADF have started a group dedicated to ADF Development Methodology.
Their immediate call to action is running an ADF Methodology session at Oracle OpenWorld as part of the un-conference program.
You can read about this session in this Oracle wiki page.
This is definitely a must attend session for anyone who is doing ADF work - you can register here.
That said aside, their Google group is also worth reading in the meantime. They are discussion all sorts of interesting things in there. So check it out here.