(Edit: I'm also noticing the flat green background peeking out on the Right and Bottom edges of the Desktop edition screenshots folks have posted. That shouldn't be there. Can others confirm this?
It's fine for me. Maybe you need to ask evoorhees what desktop environment and/or window manager he's using.
Here's how it looks in XFCE 4.10 on Ubuntu 12.10:
Thank you for the screenshot. I'm also developing in Ubuntu (Gnome/Metacity), and this is exactly how it should look. Sometimes there are Java Look & Feel platform differences to account for... but I digress into technicalities.
Screenshots from other platforms/versions are most helpful! Anyone running this on Mac yet?