Connect additional DVI displays to your computer via USB with the Gefen USB to DVI Display Adapter. Gefen's adapter makes it easy to utilize additional displays from a single PC or Mac.
The EXT-USB-2-DVI is easy to install and just requires an additional available USB port on your Windows or Apple-based desktop or laptop. Install the drivers from the included CD and you're ready to add more monitors in seconds.
The USB to DVI is very expandable, as well. With multiple units you can add up to six displays to an existing system (one USB port required per monitor).
Video
For a full video on how easy it is to add a display, check the page for the Sewell USB to DVI External Video Card.