The ViBook is a small USB dongle which lets you connect external monitors up to 23 inches in size via your computer’s USB port. You can attach multiple dongles to run more screens, and the thing supports up to 1680×1050 resolution. Low power too, so it shouldn’t destroy your port. Runs DVI or VGA and is Mac and PC compatible. Cool runnings. $129.00.
ViBook is an innovative graphics USB–DVI cable; the simplest way to add additional displays to any computer system, desktop or laptop. It does not matter if you use a Mac or a PC, or both; or if you run Win 2000, XP or Vista on your PC, ViBook is still your multiple display solution. Whenever you have USB ports, you can drive one or more extra screens. Several monitors can be connected using more ViBooks, even through a hub. ViBook plugs directly into your display DVI port or nicely sits in its cradle on the back of the display, contributing to a clutter free working desk.