http://www.oracle.com/technetwork/developer-tools/adf/learnmore/index-101235.html
The above link contains a lot of links for common adf problems and their solutions.

http://www.oracle.com/technetwork/developer-tools/adf/queueactioneventinregion-155252.html
The above link shows how the parent page can programmatically control navigation inside a region.

http://blogs.oracle.com/groundside/entry/adventures_in_adf_logging_part
The above link contains information about ADF logger.

http://niallcblogs.blogspot.com/2011/12/bpm-11g-feature-pack-update-task.html
This link contains important bpm 11g related blogs

The following are some of the things that needs to be remembered when using  remote taskflows.

• Remote taskflow activities can only invoke remote bounded taskflows with JSPX pages.
• Remote taskflow activities cannot be used in the taskflows with page fragments.
• The only way to use the remote taskflows inside a page fragment is by having inline frames in the page fragment and point it to a local taskflow with JSPX pages having the remote taskflow activity. The communication between the content of the iniline frame and the parent page/pageFragement can be done using java script.
• The calling taskflow does not propagate the security information to the remote taskflow if the remote taskflow is running in a different server.