Right. Correction to my comment above: I meant to separate the tiling wm's out of "trad desktop" distinctions: I don't think the tiling wm is what most users think of when considering desktop UIs. Still, I from what I've seen wm's like awesome or xmonad do a good job of maximising screen real estate and make everything keyboard-centric, which saves a lot of time for developers.
XMonad is really great, provided you're willing to spend some time learning Haskell to configure it, which isn't a trivial task. It's in my book a very rewarding experience.
