WindowManagers; what you prefer + why

idanity writes: "I have run linux for exactly ten years. and lately, I have reverted back to e16 and its never been better.................... I have had a love affair with many distros, wm's and have bounced between blackbox, gnome and just last year KDE 3.5 (all was good, except for KDE 4 (which is why i even reverted to enlightenment again)and in this reminiscint of e16, i wonder, ...what everyone else is running, and why ?"