Dynamic window managers support both tiling and floating window layout. There are quite a few of them, e.g. awesome, dwm, catwm, xmonad and probably many more. A lot of them claim to be stable, fast ...
I just switched from metacity to xmonad and I am very impressed by the tiling window manager concept. But I thing bothers me: In gnome a "workspace" was composed of all of my three monitors, but with ...