Today I was informed that my Google Summer of Code application to port my circular treemaps disk usage visualization tool to KDE was not accepted (sigh). However, I finally released a simple Java demo which makes it easier to understand the basic idea. It's available for download. I'm happily accepting comments at graiNnofOsaSnd AT nickPname DOT berAlin DOT dMe (\NOSPAM). =°)
It seems all the wise stuff has been said. Still, this is great.