I'm currently looking at the area of SOA High Availability, Config/Tuning.
AD4J slots very nicely in here for JVM and DB diagnostics
Download from
http://www.oracle.com/technology/software/products/oem/htdocs/jade.html
Install doc guide at
http://download.oracle.com/docs/cd/B16240_01/doc/admin.102/e11084/toc.htm
Usage scenarios doc at
http://www.oracle.com/technology/products/oem/pdf/oraclead4j_usagescenarios.pdf
Connect Apps, Extend Apps, Create New Apps with OIC