To get an overview of the possibilities of the Software Component Architecture (SCA) standard you should read this blog.
Also Oracle supports the SCA standard.
This standard let you define new components by using other components no matter which technology and protocol used. The wiring is done through configuration.
Curious if this will be used a lot by the community!
Note: The Oracle SOA Suite 11g does not contain the AquaLogic Bus, this is a separate product from Oracle.