I know, I should use a "real" window manager if I need my windows to be tiled, but I feel that tiling is a real feature with a legitimate need that should be built into Gnome.
I've dabbled with Awesome and Xmonad, but am not an expert. However I've found that Compiz Grid + Guake on Gnome gives me mouse-less window management too:
I also thought the same thing. I don't mind fully overlapping windows (a la tabs), but leaving a bunch of useless space, occupied by nothing more than a pretty picture, on my power-huntry monitor is what's inconceivable to me.
I think I've irrevocably put myself on the fringe by switching to a tiling window manager, though. Oh well. There's a little more elbow room out here.
http://guake.org/ (in most repo's)
Grid:
CompizConfig -> Window Management -> Enable GridDesktop controls:
* Position and tile a window: Ctrl-Alt-[Numpad]
* Show/Hide console: F12
* Open multiple console tabs: Shift-Ctrl-T
* Change workspace: Super-[leftarrow], Super-[righarrow]
* Start any program, open any file: Alt-F2 or Super-Space (for Gnome-Do)