There are a couple of CORBA tutorials on Sun's site - Here's a short course hosted on Sun's site by JGuru, and here's the JavaIDL trail in additional Java tutorials. Outside of Sun information, you can also search for tutorials specific to a CORBA implementation. One good example to search for is JacORB, since it's an open source ORB written in Java. Here's just one example of a tutorial I found by googling the term "Jacorb tutorial".
Write once, run anywhere, because there's nowhere to hide! - /. A.C.