I have a 28" widescreen LCD, which I treated myself to when I sold some work recently.  I swear I had it more than 3 months before I realised that I could also be using the 19" LCD I had relegated to a box under the desk...!  I can't imagine going back to a single monitor now.  In Poser/Photoshop you can have your libraries on the second monitor.  Also I just found out that my Vista widgets which show temperatures and CPU useage, which always disappear under Poser, work just fine on the second monitor, so I can actually see them while rendering.

My self-build system - Vista 64 on a Kingston 240GB SSD, Asus P5Q Pro MB, Quad 6600 CPU, 8 Gb Geil Black Dragon Ram, CoolerMaster HAF932 full tower chassis, EVGA Geforce GTX 750Ti Superclocked 2 Gb, Coolermaster V8 CPU aircooler, Enermax 600W Modular PSU, 240Gb SSD, 2Tb HDD storage, 28" LCD monitor, and more red LEDs than a grown man really needs.....I built it in 2008 and can't afford a new one, yet.....!

My Software - Poser Pro 2012, Photoshop, Bryce 6 and Borderlands......"Catch a  r--i---d-----e-----!"