I've really enjoyed using stumpwm: not only is it a tiling WM like ratpoison (in fact, stump's a successor to ratpoison, written by the same guy) or xmonad, but

I've really enjoyed using stumpwm: not only is it a tiling WM like ratpoison (in fact, stump's a successor to ratpoison, written by the same guy) or xmonad, but it also means that I always have a full Common Lisp running, which I can connect to in emacs via SLIME. It's not quite as good as a Lisp Machine, but it's better than nothing.