Password protection

You can password-protect apps like iTunes so that a family member can't buy every  record with your credit card. Go to Settings, then General, then Restrictions. Press Enable Restrictions and type a password, then turn on the restrictions you want for the apps available. Note that this password is different from your iTunes password - you'll need to tap in both. 

Add photos to contacts

You can add photos to your contacts in the iPad's contacts app. Its easy - go to the Contacts app and pick a contact. Tap Edit then tap 'add photo'. You can then move and scale the photo easily, so it fits perfectly. Once you're happy just tap Use. Alternatively, you can use the Photos app as your starting point for assigning a photo to a contact. Open the Photos app, find a photo and tap the Options button then tap Assign to Contact. 

Add a Google Calendar

Want to add your Google Calendar to the iPad's Calendar app? No problem. In Settings open Mail, Contacts, Calendars. Add an account and tap on Other. Tap on Add CalDAV Account and enter your Google Account credentials (the Server is www.google.com). Exit the Settings app and tap on the Calendar app and all your events should appear. By default all calendars are displayed, but you can tap on the Calendars button to choose which ones are shown. 

Copy music/videos from iPad to computer

Sometime we lost iTunes library or want to copy files from other iPad back to computer, because iTunes prevents user do that, you need special software to bypass iTunes. I‘d recommend iPad Magic (Windows / Mac) to you, It is a life saver when

 Sending your iPad for repair.
 Backup song/video/photo to PC.
 Moving song/video/photo to iPod or a new iPad.
 Share your iPad song/video/photo with friends.
 Computer crashed..

iPad Magic = iPad Transfer/Manager/Backup + iPad video converter + DVD to iPad Converter. It's the ultimate solution to all your iPad ripping, copying, converting and transferring problems!

 Transfer movies and songs from PC to iPad, iPad to PC, iPod/iPhone to iPad.
 Backup iPad movies and music to iTunes (Newly supports iTunes 9.2) library.
 Rip DVD/CD and convert videos/audios/ISO images/IFO folder to iPad.
 Manage several iPod/iPhones simultaneously without conflict.
 Copy contents from other iPods without wiping their iPod library.
 Supports all iPad/iPod/iPhone models.
 Fully support latest iTunes and iOS. 

Take Giant Screenshots

Another oldie but goody that many that many people don't realize you can do in the iPhone OS: screenshot anything you're looking at. And keep in mind, when this happens on the iPad, it's at 768x1024 resolution—making it potentially a lot more useful in the full-sized monitor realm than iPhone screenshots.

Push the top (power) and home buttons at once for half a second. The photo will be stored in your photo library.

Import Free Books

The iPad supports the ePub format, and you can load these books simply by e-mailing them to yourself. Apple's iBooks app is your portal to reading and buying eBooks on the iPad—and it includes a section with a few free books. But don't forget, just like iTunes and the iPod can import and play music downloaded elsewhere, the iTunes and the iPad can import and display books downloaded elsewhere. And keep in mind, iPad only supports ePub (with or without DRM).

Your local library may be a great source for free ePub checkouts. Also, Project Gutenberg has 30,000 free ePub books you can download, all of which have fallen out of copyright. There's lots of good stuff in this collection if you read classics, and the project even has an RSS list for new arrivals.

If you want to convert PDFs and other DRM-free formats to ePub, you can use Calibre.

Change your Default Email Signature

The default email signature on the iPad says, ―Sent from my iPad.‖  It finds that to be a little boastful. To remove the Apple marketing and become like a real person, go into Settings and tap on Mail, Contacts, Calendars. Find Signature in the fourth section down. Type whatever you wish.

Tips to Extend iPad Battery Life

It‘s claimed that iPad‘s battery life can support ―up to 10 hours of surfing the web on Wi-Fi, watching video, or listening to music‖. Here are some useful but not happy tips to help you use your iPad a lot longer without having to plug in all the time.

 Turn off all apps and functions you don‘t use.
A lot of functions are turned on by default, so go to your settings and turn off everything you don‘t really use.
 Live streaming and downloads
Live streaming videos like youtube and download stuff from sites will significantly drain your battery power. Wait until you can get to a place where you can plug in to do those
 Screen Brightness
Turn down your screen brightness and lights. To do so go to Settings > Brightness & Wallpapers > Then drag the slide to the left.
 Stay away from games
Don‘t play games if you know you‘re going to use your iPad battery power for something else more important. That‘s a battery killer.
 Emails and Social Networks
You can check that facebook & twitter page later on your desktop or laptop. Oh, the emails. Do you have to check that now?
 Disable Wi-Fi and Bluetooth
But, no game, no Youtube, no Facebook, no Twitter, no email, why I use iPad?

Get Back a Deleted App

If you delete an app, either accidentally or because you don‘t think you will use it, you can always get it back one of two ways.
Way 1:
If you have synced your iPad with iTunes since downloading the app, it will be in the Apps tab of your iPad‘s screen in iTunes. Just recheck the box for that app.
Way 2:
Without tethering to your computer, just find the app in the iTunes App store on the iPad and download it again. You will see a prompt that you have already bought this app and an option to re-install it without having to pay for it again. It is a little nerve-racking, especially if the app is an expensive one. But don‘t worry so long as you are sure that was the app you deleted. 

Turn iPad caps lock on

You do this by double tapping the shift key on either side of the keyboard. This is on by default. If you need to type a whole word in caps this can be painful. You control that in the Settings as well. In Settings tap on General and Keyboard to find the item. Set Enable Caps Lock to ON.

Add Two More Apps in Dock

There are four default apps in your dock at the bottom of the iPad screen. But you can actually add two more. As you would move any app to a new location or screen, tap and hold one of the app icons till it starts dancing. Then move it on to the dock. 

Easy/Quick Mute

Unlike the iPhone, there's no dedicated mute switch on the iPad. There you are, in the back row of a funeral just minding your own business when, oops, you forgot to mute those YouTube clips on your iPad! However, you can still cut the sound in a hurry if you need to pretend you're doing something serious instead of watching the latest YouTube viral.
Apple decided to make the volume buttons do double duty. Tap them repeatedly and the volume will go up or down. But if you press and hold the volume down button for about two seconds, then you get a quick mute.

Shut Down Your iPad For Real

When you press the power button on the iPad it really just turns off the screen. That‘s why it comes on so fast. What you may want to do to conserve battery life or recover from a freeze is do a reboot.
To do this just hold down both the power button and Home button until the red slider appears on the screen. Slide it and the iPad will shut down. Give it a minute and then you can restart it by pressing the power button again. It seems to take a few seconds before it responds so be patient. And, to force quit an application, just hold the home button by itself in a similar fashion.