If you're planning to work a lot on your iPad, you'll need the Apple Wireless Keyboard ($70), which connects to the iPad (and even the iPhone) via Bluetooth. It's the same size as a Macbook keyboard, in the sense of the size of the keys, only thinner.

The keyboard requires two AA batteries, which lasts an amazingly long time. The keyboard powers down when not in use and automatically starts up as soon as your fingers touch the keys.

However, this presents a problem: The keyboard often turns on accidentally, which signals the nearby iPad to fire up via Bluetooth. The workaround is to turn off Bluetooth on the iPad when you're traveling.

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