Hacking Swing: Translucent Windows
Subject:   Real transparency
Date:   2008-08-08 22:31:38
From:   timothyb89
Assuming the host platform supports it, JDK 6 (u10-beta?) supports "true" transparency, as described here:

It seems like a nice solution and solves many of the issues with the hack. The only problem here is that you need hardware and software support for it, and the lack of support is getting less and less common.