The iPad is a new and wonderful plaything, but it’s also a mini-computer that holds large amounts of your personal and private information in e-mail messages, contact lists, photos and apps for social networks and other services. And so it’s wise to think about how to keep this private information private should you lose your iPad or leave it unattended for a spell, or if it gets stolen.

Malware is unknown to the device as of yet, but users should, as with any computer, avoid using unknown Wi-Fi networks, which miscreants could be “sniffing” to collect valuable data, and remain alert to common scams, like phishing, that try to trick users into providing sensitive personal information.Beyond that, here are security and privacy tips for iPad users:

Lock your iPad

This is basic security from prying eyes that’s free and easy. Tap the “Settings” icon on the home screen and then select “General” and “Passcode Lock.” Then set the four-digit code you want to use to unlock your iPad when you turn it on or wake it up.

You can choose among several intervals of time of inactivity before it will ask for the code again, though Mr. Rouse recommends choosing a short interval. He also recommends that users set their iPads to erase all data if someone enters the wrong code 10 times. If you cause the erasure accidentally, you can always restore your information by syncing your device with your computer. Note that a code won’t necessarily stop a determined thief from accessing content on your device by connecting it to a computer.

You could also buy a case with a physical lock on it to keep co-workers, classmates and family members out.

Find or disable a lost or stolen device

Apple’s MobileMe service has a feature called “Find My iPad” (or iPhone) that can help users locate a lost device.

Using your computer, sign up for MobileMe and activate the feature by logging into your account and following the on-screen instructions to see the approximate location of your lost property on a map.
If you discover that you left it at a bar, say, you can remotely set a four-digit passcode and lock it (if you haven’t already) by clicking “Remote Lock.” Then you can write a message that will be displayed on the screen to whoever may have found it — like, “Oops! Left my expensive, coveted iPad at your bar. Please call me at xxx-xxx-xxxx. Coming to pick it up now!” — even if it is locked.

If you go to the bar and get blank looks, have MobileMe override the ringer volume or silent setting and play a sound to help you locate the device. (NYT)