Yes! (Score 1)

I work at an insurance office, where increasingly we are seeing manuals and other content digitized. It helps are underwriters greatly to have the manual on one screen, while using it to do their rating on the next. We are working (with the big boss fully behind it) to move everyone to dual screens. We are also working on going paperless, now we can have whatever piece of paper would have been on our desk on the second screen.

It's also great for surfing porn on one screen while firing off an email to your boss about how busy you our on the other >)