If you want to use multiple monitors, you either have to have a graphics card which supports it or a laptop capable of handling this. Typically this allows you to have two monitors plugged in at one time, but what if you want more? A device which makes this possible is is a USB to VGA/DVI adapter (NewEgg link).
I recently gave this one a shot with my laptop and it works really well (with an additional monitor plugged into the VGA output). One thing to note is USB 2.0 bandwidth is not as fast as VGA or DVI so monitors plugged into this device may not be as smooth as when they are plugged into a native VGA or DVI port. Just about all my usage is for business (Internet/email/Word/Excel/browsing/etc.) and I did not really notice a difference.
As long as you don’t intend on gaming or watching high quality movies on a monitor running through one of these devices it should do the trick. If you were to use it as a way to add a third (or more) monitor, it can do the trick nicely.
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Thanks for your recommendation. It is just what I needed however it seems to be currently out of stock in newegg. Anyway found this while searching on google. It supports not only to VGA/DVI but also USB to HDMI which is real cool.
http://www.shenit.com/usb-to-hdmi-vga-dvi-multi-display-graphic-converter-adapter.html