Repurpose an Old Laptop
Dualview has made my life much easier, but I still find myself without enough desktop space.
It seems like I'm constantly juggling windows, but I can't add a third display because my laptop only supports a single external monitor. So I investigated higher-resolution monitors that would allow me to fit more windows on a single screen. Unfortunately, the 20" LCD displays that I like cost more than $1000, which is far more than I can justify for saving a few mouse clicks.
If money is not much of an object, check out the DigitalTigers product called SideCar that lets you run as many as four external monitors from your laptop. You end up with a huge desktop display and still have the mobility of a laptop.
However, I have an old laptop with a perfectly good display going to waste in my basement. The laptop itself is almost useless—the keyboard is flaky, the mouse buttons don't work, and the hard drive is barely large enough to install Windows XP. I found a way to turn that laptop into a second external monitor though, and it didn't require any extra hardware.