Jason,
CORBA stands for Common Object Request Broker Architecture. It acts as a "middleware" between two different systems and allows their objects to interact even if the systems aren't all compatible (e.g. C++ and
Java).
The place I went to learn more about CORBA is the Object Management Group's site (www.omg.org). They are the organization responsible for creating and maintaining CORBA as a universal standard. There's all sorts of intro stuff and tutorials, et cetera.
Once you get the basic idea, I know that developer.java.sun.com has some tutorials relating CORBA to Java.
I haven't used it in a project so I don't know if this information is adequate or not, but if you read it all, you'll be ahead of me!

Eric