Kensington USB Dual Monitor Adapter [DVI USB Monitor Adapter, Up To Six Screens On Offer Via USB Connections]

For those looking to add additional screens to their PC setups on an
above what their graphic card is capable of providing, Kensington's new
USB Dual Monitor Adapter, which works with both Windows and Mac
operating systems (the latter courtesy of a beta driver) could be just
what you need.Capable of supporting resolutions up to 1440 x 900
(widescreen) and 1280 x 1024 (standard aspect ratio), Kensington's USB
Dual Monitor, which utilises DisplayLink technology, can be used to add
up to six displays using a single adapter for each additional display
and comes with DVI port - those looking for a VGA connection simply
using an adapter.
Kensington USB Dual Monitor Adapter Features:

Add a second computer screen with just a USB connection
Double your visual workspace for multi-tasking ease
Easily compare documents side-by-side
No more tabbing and flipping through open windows
Add up to six monitors to your computer, one for each Kensington Dual
Monitor Adapter unit.
Simple set-up. Connect monitor cable to the Kensington Dual Monitor
Adapter, then plug into USB port of your computer
DVI digital video output for sharpness and clarity
Works with any Windows XP or Vista notebook. Now works with MacBook
computers via the beta version of the Mac driver! Works with any monitor
- regular or widescreen, with DVI or VGA input. VGA / DVI cable sold
separately.

Kensington USB Dual Monitor Adapter Specifications:

Video modes: Mirrored desktop, extended desktop, primary display (Vista
only)
Supports widescreen monitors up to 1440 x 1050 pixels; and standard
monitors up to 1280 x 1024 pixels in 32 bit color
Video output: DVI-I (female connector), VGA (female connector)
VGA adapter & USB cable included
Windows XP and Vista compatible; works with Intel based Mac OSX 10.4.11
or later computers via Mac Beta driver

The Kensington Dual Display Adapter has just been made available for
just shy of $120.

Kensington