Sun’s Java Desktop System, currently based on SuSE Linux
JDS Help, with software and informational resources for the Java Desktop System
Red Hat Linux
Graphical User Interfaces / Window Managers:
Window Managers for X guide by Matt Chapman.
Windowmaker is my favorite window manager.
You can find decorative themes for most every window manager in existence at themes.org.
More X11/window manager information can be found at WWW.X11.ORG.