Speaking of, I've been running pretty stable here with the latest build. Try it out!
Things to work on next: more experimentation with building the z-order list, adding a mutex to prevent multiple program instances running simultaneously, and user defined hotkey support. This last one should be pretty important, as I'd like to emulate Sawfish's ability to allow the user to switch quadrants while keeping the focus'd window visible. (Not to mention hotkey support for switching desktops.)
Fun, fun, fun. :)
Of course, all of this is dependent on my ability to put down Cryptonomicon, which I'm reading for the second time! Neal Stephenson is GOD. If you haven't read In the Beginning was the Command Line and Mother Earth, Mother Board I'll assume for the record you've been in a coma for the last five years and forgive you.