Wi-Fi syncing will allow you to wirelessly transfer apps, music, podcasts, books, contacts, movies, TV shows, photos, notes, ringtones and more from iTunes on your computer to your iOS devices.
To utilize wireless syncing on your iPad, iPhone and iPod touch you will need iOS 5 (or later) and iTunes 10.5 (or later) on you Mac or PC.
How to Setup Wi-Fi Syncing
Now that Wi-Fi syncing is enabled, every time your iPad (or other iOS device) is connected to a power source it will automatically sync and backup your content. You can also use the manual sync option as described in step 4.
Note: Your computer and iOS device must be on the same Wi-Fi network to utilize Wi-Fi syncing. You will also need to leave iTunes open or running in the background on your computer.
You will also notice that your iOS device will appear under Devices on the left in iTunes whenever iTunes is open without it being plugged into your computer. That means you can click on the device and make changes under Summary, Info, Apps, Tones, Music, Photos, Books, etc. The new setting and content will sync to your iOS devices even if it is in the sleep mode and in a different room.