You will love it, trust me.
Buy a monitor that is exactly the same brand and model # if you can get it.
You will need a second dual-head video card in your computer, or at least a second single-head video card, but most are dual head. If you have the cash, swap the dual head card you have now out for a triple or quad. Expensive but super fast. You may need to upgrade your power supply too.
Good discussion on this here:
http://www.tomshardware.com/forum/26...onitors-nvidia
If you want to do it a cheap way, you can get a USB to VGA Adapter for only $100.00 - no video card required.
http://www.Multi-Monitors.com/product_p/usbvga1.htm