Simulating two virtual monitors on one physical monitor

Is there a application or system extension to allow simulating two virtual monitors on one physical graphic card output?
The origin of the problem comes from the wish to drive two external displays from a macbook pro. (without USB driver!!)
The only solution is to use Matrox Interfaces that tell the system that one big screen is pluged to the grafic card. So the Graphic card puts out a signal for a big widescreen dispaly. The Matrox splitt it up the two physical monitors.
The problem is that dual screen applications like Aperture or apples color don`t work with floating windows and no window snapping works good etc.
So a system extension or thired party application must split the one big display coming from the matrox in two virtual displays that are like the original two.
It is a shame that apple don`t provide this functionality (two external monitors) on their high end laptops. They may loose their attention on the pro user and keep on focus on the dummy Iuser. Unfortunately this means a reduction of quality in their high end products.
Thanks for answering that wired question!

The only thing akin to what you want in OS X is Spaces (System Preferences) which can be used to set up virtual screens. I don't know if it's what you are looking for. I'm not aware of any such third-party utility although you can search for one at VersionTracker or MacUpdate.
I suppose there may also be a commercial product around, but I don't know of one. Matrox makes a hardware add-on for having multiple monitors on a laptop, but I don't know if they have a utility such as you have described. You may find something doing a Google search.

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Simulating two virtual monitors on one physical monitor

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