Uses for multiple monitors:
Geekitude, .NET development, playing Civ3 without having to scroll (ever), pretending to be flying a spaceship.

Slackmaster K, Sep 23 2006

Config 7783
WinXP, WinVista, 6 monitors, 4 video cards
AthalonXP (Barton core) 3200+, 2GB DDR, 10 HDDs = 2.2TB
Card 1:
AGP ATI All-In-Wonder 9600
TV Tuner doesn't work when multiple Radeons are installed.
Card 2:
PCI ATI Radeon 7500, ATI Radeon chipset
Laggy
Card 3:
PCI ATI Xpert 128, ATI Rage 128 chipset
laggy
Card 4:
AGP Maxivista Virtual VGA adapter, Maxivista Virtual VGA Adapter chipset
Connected to a nearby P3-450