You might also want to check out tiling window managers such as xmonad [1]. There are also instructions on getting it working under OS X [2], but I haven't tested that (since I do not own any computer running OS X).
Unfortunately, while OS X can run an xserver to use with programs that are written to use X11, it has its own native window manager for native Mac programs. (To give you an idea of how rare X11 programs are, the xserver is an optional install, as part of the developer tools.)
As far as I can tell, xmonad running on a Mac is still only an X11 window manager.
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[ 5.2 ms ] story [ 15.9 ms ] thread[1]: http://xmonad.org/
[2]: http://www.haskell.org/haskellwiki/Xmonad/Using_xmonad_on_Ap...
Unfortunately, while OS X can run an xserver to use with programs that are written to use X11, it has its own native window manager for native Mac programs. (To give you an idea of how rare X11 programs are, the xserver is an optional install, as part of the developer tools.)
As far as I can tell, xmonad running on a Mac is still only an X11 window manager.