I was totally unable to use the "Screens and Graphics" utility that came with Gutsy Gibbon Ubuntu to setup my dual-chip Quadro NVS 440 card for two monitors. I made my own config in the end.

Section "Files"
EndSection

Section "Module"
	Load		"glx"
	Load		"v4l"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"	"/dev/input/mice"
	Option		"Protocol"	"ImPS/2"
	Option		"ZAxisMapping"	"4 5"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"screen1" LeftOf "screen2"
	Screen		"screen2"
	Option		"Xinerama" "on"
	Option		"Clone" "off"
	Inputdevice	"Generic Keyboard"
	Inputdevice	"Configured Mouse"
EndSection
Section "device"
	Identifier	"device1"
	Boardname	"NVIDIA Quadro NVS 440"
	Busid		"PCI:3:0:0"
	Driver		"nvidia"
EndSection
Section "screen"
	Identifier	"screen1"
	Device		"device1"
	Defaultdepth	24
	Monitor		"monitor1"
	SubSection "Display"
		Depth	24
		Modes	"1280x1024" "1280x960" "1152x864" "1024x768" "800x600"
	EndSubSection
EndSection
Section "monitor"
	Identifier	"monitor1"
	Vendorname	"ViewSonic"
	Modelname	"ViewSonic VP181b-2"
	Horizsync	30-92
	Vertrefresh	50-85
	Option		"dpms"
EndSection
Section "screen"
	Identifier	"screen2"
	Device		"device2"
	Defaultdepth	24
	Monitor		"monitor2"
	SubSection "Display"
		Depth	24
		Modes	"1280x1024" "1280x960" "1152x864" "1024x768" "800x600"
	EndSubSection
EndSection
Section "monitor"
	Identifier	"monitor2"
	Vendorname	"Dell"
	Modelname	"Dell D1025TM"
	Horizsync	31.0-85.0
	Vertrefresh	50.0-120.0
	Option		"dpms"
EndSection
Section "device"
	Identifier	"device2"
	Boardname	"NVIDIA Quadro NVS 440"
	Busid		"PCI:4:0:0"
	Driver		"nvidia"
	Vendorname	"NVIDIA"
EndSection