I write a lot of code, and I prefer my editor window (emacs) to be 100% of all my screen space. (ideally, not even title bar, but not going for that yet...).
I usually stretch it out, but in 11.10 (Gnome), there's this really frustrating auto-maximize to a given monitor 'feature'.
I've tried forcing the size to be 2880x900 and setting the window to be non-maximizable in CCSM, but no go.