From the KDE website:
The Window Maker development team released today the version
0.50.0 of the reknown window manager. Most of the window management
mechanisms defined by KDE are included (exceptions are sound events
support and mini-icon setting). Alfredo Kojima states in the NEWS
file distributed with the source that there could be some problems
in the virtual desktops management because of implementation
incompatibilities between Window Maker and standard kwm modules
(like kpanel). Grab the source
here. Many thanks to the Window Maker developers for their
excellent work.