I'm a busy gal, and most of the time find myself working wherever I can — on the couch, on the train, anywhere I can find a WiFi signal. But when I'm at the office, I like to not only use my laptop monitor, but hook it up to my cinema display and double my desktop real estate. When I'm at home? It's a single screen for me.
I do notice a big difference in productivity when I have more than one monitor. I typically use my laptop screen for emails and IMs while my cinema is used for blogs and writing up posts. However, one of my friends is an animator and uses three screens daily. Needless to say, he's got a huge desk. What about you — are you a single-screen gal, or do you make the most of your desk space and use multiple monitors? How many monitors do you use?