Personally I'd say it saves me a few hours a month: A little by not constantly fumbling around switching apps, and (much more significantly) it makes fixing so

Personally I'd say it saves me a few hours a month: A little by not constantly fumbling around switching apps, and (much more significantly) it makes fixing some bugs easier because you can see the effects of your code and your code at the same time, so there's no need to mentally 'flip' from 'coding' mode to 'web site evaluating' mode. And with three monitors editing an image->uploading the image->updating html/css->viewing the web page becomes one seamless workflow. I think that I'm probably on the extreme end, but when I can I code with three monitors, a 22" widescreen for code & ftp or versioning, 22" widescreen for photoshop or illustrator, and 'normal' 19" for browsers (since it's much closer to the average use). Newegg.com currently sells a nice 22" LCD for under $200, so if it saves a programmer at normal US wages 2-6 hours lifetime, it's paid for. It strikes me as a no brainer.