There are many facets to this product, but we have primarily been making use of SCA, BPEL, Mediators, and JMS, along with a number of extension products. We are expecting to make extensive use of several other aspects of the SOA (and its containing WebLogic server) in the near future, specifically OSB and Coherence.
It has allowed us to build integrations using an enterprise-class platform. It has also meant that we have been able to purchase prebuilt integrations from Oracle for their products, meaning we have been able to focus largely on our own solutions.
It should be noted, and we have proven with our own experience, that to really get good value out of the product you need to have some good development approaches, as well as knowledgeable people on the team because middleware is very easy to do badly, and then it becomes an impediment. As they say, with great power comes great responsibility.
With the availability of Maven the adoption of Continous Integration can be really driven fowards.