Here it comes the easiest solution for multi-monitor fans, a USB Video Card from Witech called Multi-I!

This is needed when you feel two monitors are insufficient for your cramped online activities. Witech Multi-I USB Video Card is easy to setup and very beginner-friendly. Witech Multi-I USB Video Card has two D-Sub connectors for hooking up two monitors and there are two more additional USB ports so you can juice up two identical Witech Multi-I USB Video cards, all thanks to the DisplayLink core inside!
Witech Multi-I USB Video Card - Support Multi-Monitor Display
The largest supported screen resolution is 1400×1050 and each of the Witech Multi-I USB Video Card require an AC Adapter to power-up and as an additional support for extra load. Witech Multi-I USB video card has available in Korea for 170,000 Korean Won.
(via EverythingUSB and iTechNews)
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