Splashtop's XDisplay is one of several apps that will let you use your iPad as a second display.
For all the talk about a “post-PC” world, most people use smartphones or tablets as an addition to their existing technological arsenal, rather than a replacement for a standard laptop or desktop. In fact, there are a number of ways to combine the capabilities of your PC and mobile device that can make your tablet or smartphone an even more powerful tool. In this article, the first in a series, we'll take a look at ways to use your computers and mobile devices in tandem to get more out of each of them.
Multi-monitor setups are becoming increasingly common on desks in homes and workplaces, and as a multi-monitor user I can say that I've developed quite a few habits and workflows that rely on that second monitor being there. I normally use one display as my primary workspace—mostly used for writing, researching, and general Web browsing—and the second display for things I like to be aware of at a glance, but don't actively need every minute of every day—things like e-mail, Twitter, and IRC. While I'm traveling, I miss the convenience and flexibility of that second screen.