I just saw that the heavyweight/lightweight mixing problem in Swing is fixed and will be part of 6.0u12. I'm very happy to see this, at long last.
Finally, embedded JDIC browsers (even in NetBeans), 3D content, etc. can be added to a JComponent without z-order problems.
Of course, JWebPane will make JDIC basically obsolete anyway, but what the heck.