Uses for multiple monitors:
http://www.kconnolly.net/office.aspx - Development, gaming

Kevin Connolly, Jan 10 2012

Config 9204
Win7, 8 monitors, 2 video cards
AMD Phenom 2 1055T 6-core CPU
16GB Ripjaw DDR3
6x Asus VE245 monitors
2x Asus VE248 monitors
Card 1:
PCIe, ATI Radeon HD 6850 chipset
ATI Radeon HD6870 Eyefinity 6 Edition. ATI CCC (now AMD Vision) is buggy and clunky, making it a PITA to set up, but it works. Heavy artifacting while Aero Glass is enabled.
Card 2:
PCIe, Nvidia unknown chipset
MSI NF970-G65 onboard dual outputs; nForce 980a SLI (I couldn't be bothered to look through that list)