Thare is work for support of IIOP going on, but I do not know the status.
Another way would be to use XmlBlaster, a Java MOM/XML server, which has great suppport for corba/c++/perl/phyton.
I have done some integration work on it with regards to JBoss and its a very stable and nice plattform, good to have in ones toolkit.
If what you are doing is fairly simple and from Windows then Active JMS would work (active-jms.sourceforge.net). If you're not just on Windows and I would suggest looking into JMS Courier (http://www.codemesh.com/en/JMSCourier.html). Good luck!
Ideally, someone should write a C and C++ interface to the JMS functionality. Maybe something a little bit like the interface in Fiorano MQ. We want to keep it as simple as possible, though.
We and our customers have existing apps written in C and C++ as well as Visual Basic (in the case of one of our customers). We don't want to complicate things by introducing IIOP or other messaging systems. We want to interface directly to JBossMQ.