Just back from a trip through a few Asian countries and this is not a feature of any laptop made.
There are COMPONENT to USB devices but the LAG would cripple game play. A HDMI display is the cheap exit.
I've heard that there are some laptops that have HDMI input/output so we could hook up a PS3 using the HDMI and turn the Laptop into a screen. Does anyone know which laptops do this?