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You can buy a video spitter so you can have two screens connected, but they will both be displaying the same thing.

Not sure if its possible to have 2 seperate screens as an extension of your desktop, but the GPU is powerful enough to do it.
 
There are solutions to do this in a really bad way (like Matrox's dual- or triple-Head2Go), but those only work with VGA and they make your computer think all the extra monitors are only one monitor -- which is bad for a number of reasons.

There was one post by a guy who had another piece of equipment that allowed him to run 3 external monitors on his MBP as *real* separate DVI monitors, but I don't remember the name of it. I got the impression it was really, really expensive though.

Try searching, this has been talked about a LOT.
 
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