Trying to understand dual displays

I've recently got a second monitor and got it setup and running with fluxbox but after reading loads of posts about two monitors I have a few questions:
Currently each monitor runs its own screen, if I start firefox in one then try to access it from the other I get a message saying that it knows that it is already running but it can't connect to it. I assume this is because of having multiple screens. How can I get around this? I'd like to be able to click a link in evolution in one screen and have the page open in firefox regardless of which screen it is on (i.e. I don't want to add --display ... on the command line).
I can't drag windows between screens. Again, i assume this is because of multiple screens. I've been told xinerama would help this but I've seen quite a few posts with people shouting about how bad xinerama is. Can people comment, and if it is as bad as some people say, is there an alternative?
Lastly, both monitors are lcd but the one plugged into the dvi socket has a pink tinge to it, the one on svga has a blue tinge. Someone said this is normal due to the digital output from dvi, is it?
Ta

Well, if you are using nvidia/twinview already, setting it up shouldn't be too complicated. I have a similar setup, except both of my monitors are connected via DVI. I am posting my xorg.conf below to give you an idea of what may be needed, although some things won't apply to your case (naming schemes, modules, etc). At the moment, the setup works just fine, but I have been meaning to clean it up and make sure nothing is wrong (which I'm not at the moment...but it works ). The DEVICE section is what you want to look at for now. If you have any questions about something in the file, let me know.
Section "ServerLayout"
Identifier "nVidiaTwinView_2560x1024"
Screen 0 "DualHead_2560x1024"
InputDevice "LogitechUltra-X" "CoreKeyboard"
InputDevice "WirelessIME2.0" "CorePointer"
EndSection
Section "ServerFlags"
Option "AllowMouseOpenFail" "false"
Option "BlankTime" "0"
Option "StandbyTime" "10"
Option "SuspendTime" "0"
Option "OffTime" "0"
Option "Xinerama" "false"
EndSection
Section "Files"
RgbPath "/usr/share/X11/rgb"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/100dpi"
FontPath "/usr/share/fonts/75dpi"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
FontPath "/usr/share/fonts/artwiz-fonts"
FontPath "/usr/share/fonts/cyrillic"
# FontPath "/usr/share/fonts/encodings"
FontPath "/usr/share/fonts/local"
FontPath "/usr/share/fonts/misc"
# FontPath "/usr/share/fonts/util"
EndSection
Section "Module"
Load "dbe"
Load "ddc"
Load "extmod"
Load "type1"
Load "freetype"
Load "bitmap"
Load "glx"
# Load "dri"
Load "record"
Load "xtrap"
EndSection
Section "InputDevice"
Identifier "LogitechUltra-X"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
# Option "XkbVariant" ""
# Option "XkbOptions" ""
EndSection
Section "InputDevice"
Identifier "WirelessIME2.0"
Driver "mouse"
Option "CorePointer"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/psaux"
Option "Buttons" "5"
Option "ButtonMapping" "1 2 3 6 7"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "false"
EndSection
Section "Device"
Identifier "nVidiaQuadroFX1300"
VendorName "PNY Technologies"
BoardName "NV38GL [nVidia Quadro FX 1300]"
Driver "nvidia"
BusID "PCI:4:0:0"
Option "NoLogo" "true"
Option "RenderAccel" "true"
Option "TwinView" "true"
Option "TwinViewOrientation" "RightOf"
Option "MetaModes" "1280x1024,1280x1024; 1280x1024,NULL"
Option "ConnectedMonitor" "DFP-0,DFP-1"
Option "SecondMonitorHorizSync" "28.00 - 64.00"
Option "SecondMonitorVertRefresh" "60.00"
Option "UseEdidDpi" "false"
Option "DPI" "96x96"
EndSection
Section "Monitor"
Identifier "DFP-0"
VendorName "Sony Corporation"
ModelName "SDM-S74"
HorizSync 28.00 - 64.00
VertRefresh 60.00
Option "DPMS"
EndSection
Section "Monitor"
Identifier "DFP-1"
VendorName "Sony Corporation"
ModelName "SDM-S74"
HorizSync 28.00 - 64.00
VertRefresh 60.00
Option "DPMS"
EndSection
Section "Screen"
Identifier "DualHead_2560x1024"
Device "nVidiaQuadroFX1300"
Monitor "DFP-0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024"
ViewPort 0 0
EndSubSection
EndSection

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