Or you could use a graphic lcd (only slightly more expensive). Then, just convert the image on the PC to a bitmap and send over serial. The arduino can easily display this on the lcd.
You seem surprised that this requires code on the computer. How did you expect for the arduino to take a screenshot?
Cool idea! That expands the idea. If there is a animation on the area that is convertered to bitmap. How fast could I update the bitmap-2-LCD so it wont "lag" too much? Know what I mean?
Naah, I'm not suprised...