At the office, I have two nice, big monitors so I can spread out my work. I have become so accustomed to this much real estate that when I work from home, not having two monitors becomes a noticeable hindrance to my productivity.
While I do have a second monitor at home to attach to my laptop, I primarily remote desktop into my machine at the office, and that meant going back to a single monitor -- until now!
With Windows 8 (or maybe it was 8.1), the remote desktop client allows you to utilize all your local monitors. It's really easy to use, too. Just check the checkbox!
Update: I'm told this works in Windows 7 as well -- seems this was a well-kept secret.