The five best productivity apps of 2012

PC World - It's been a big year for smartphones—the iPhone 5, the Galaxy S III, the debut of Windows Phone 8—but as always, it's the apps that matter.

Thankfully, 2012 witnessed the arrival of many killer apps for business users, tools that can save time, lower costs, and turbocharrge your overall productivity. Best of all, those that aren't free cost only a few bucks.

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