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For all the talk about a “post-PC” world, most people use smartphones and tablets as additions to their existing technological arsenal, rather than a replacement for a standard laptop or desktop. What many users fail to realize is that 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. We've previously examined how to use your mobile devices to make your PC more useful: we talked about how to turn a tablet into a second monitor, how to make your phone a file server, how to use your phone as a keyboard and mouse, and how to easily stream your video library to your phone or tablet. This week, we'll talk about how to use your smartphone as a document scanner.