I am running XP and FS9 with an NVidia card 8800 GT OC which has the capacity to take two monitors albeit one is a 19" and the other 17".
Everything plugged in and tweaked or so I thought. My primary monitor has been identified. I can open a programme in my primary and drag it into my secondary monitor with no difficulty, like for instance a fuel planner etc. When I run the sim however the only window that I can drag across is the kneeboard. Can't move GPs, throttle window etc. to the second monitor. I run the sim in full screen but I have tried it out of full screen and tried to undock the GPS window then move it over but with no success. The NVidia control panel identifies the primary by model number and the secondary as simply analogue.  I've even tried to stretch the view to cover both monitors through the NVidia control panel which works to an extent as the right hand end of the task bar appears on the second monitor but when I start the sim on the select aircraft, location, fuel screen it has the jitters and my mouse pointer flashes rapidly on and off. This is driving me nuts! The really puzzling aspect is how I can drag over the kneeboard and nothing else.
I am really hoping that one of you guys out there can help me on this.

best regards  Crocker

the flickers are being caused by trying to run FS split into 2 different resolutions... but that's not a very good idea anyways, since, even if it worked, the centerpoint of your view would be at the seam between the monitors... not much help when landing  

did you try right clicking the other panels to get the context menu? I'm pretty sure there is an 'Undock' option there... that will put the panel into it's own window, which you can drag to the other display

I'm not sure... but maybe you have to run FS in windowed mode to get the Undock option

just a guess really  

Cheers

Have you checked that both monitors are running at the same refresh rate (e.g. 60 Hz), also how are you attaching the two monitors to the system? Different graphics cards?