Link to 9X Media. Sponser of the Multiple Monitors.org site

9X Media's Patent - The technology behind the 9X Media X-TOP modular multi-screen system that supports 2-9 monitors.
Link to 9X Media site Link to Multimon

Multiple Monitors.Org - Article/White paper discusses technology and trends leading to adoption and use of multiple monitors.
Silicon Image - White papers detailing DVI and digital technology.
Panoram Technologies - Articles and papers on the technologies Panoram employs in their multi-screen solutions and large visualization systems
Appian - White papers on multiple monitors, technology, benchmarking and evaluating solutions.
Multi-Mon - RealtimeSoft - Multiple monitor troubleshooting section addresses most common technology related problems.
Development of three crucial components has paved the way for mainstream multi-screen computing, they are: DVI (Digital Visual Interface), operating system software and video card technologies. The ability of these components to provide dynamic, high-quality multi-screen display systems possible has introduced a whole new way of designing display systems and in doing so has launched a new industry that provides a timely opportunity for multi-screen solutions.

MULTIPLE-SCREEN TECHNOLOGY TRENDS

Microsoft, Apple, Sun, and Linux have all recognized the need for increasing usable screen space. Windows 98 for example is capable of interfacing with as many as 8 screens at a time.

At the same time, many of the top video card manufacturers have also been following suit by developing video cards capable of splitting the video signal into multiple outputs. Using any of the forementioned operating systems along with a multi-channel video card your computer is capable of.

Below are several links to multiple monitor technology related sites/sections.

3D Labs - Articles detailing the technology behind 3D Labs' Oxygen and Wildcat video cards.
ViewSonic - White papers detailing technology ranging from DVI to multiple monitor solutions and LCD transitions.