The Nintendo DS has long had the bragging right of dual screens, so it’s only suitable that someone would enter the market with an external stand alone 4.3-inch 800×480 LED backlit LCD screen, right? The Century made LCD is compatible with OS X and XP/Vista, and requires no external power source since it connects via USB. It sure as hell would make for a suitable IM window while gaming, or you could just invest in one of these.
Oh ya, it costs $200, as much as a 19-inch LCD.
It’s available here