Best Keyboard: Type Cover for Microsoft Surface
Every tablet has a virtual onscreen keyboard for typing, and they're all useful for short periods. But for any prolonged typing—such as in a Word document—you'll want a physical keyboard. The best one is by far Microsoft's Type Cover, an optional purchase for its Surface tablet. It's a thin keyboard that also serves as the Surface's cover, yet it feels like a real keyboard. There's even a built-in trackpad.
Microsoft also sells its Touch Cover ($120) for Surface tablets. It comes in various colors and has a trackpad, but it isn't as comfortable for sustained typing, and there have been reports that the Touch Cover isn't terribly durable.