You either want an NVIDIA video card or a dual head to go.... either way you will either want to run this off a laptop so you still have a screen or a dual head video card plus the splitter. You WILL have a line where the projectors meet, this does nothing to get rid of that. Media servers will take care of that/do the blending for you.
http://www.matrox.com/graphics/en/gx...dh2go/home.php