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Skype is the standard for audio/video chatting in the business world, and the Android version works well on tablets. Video chatting works very well on Android tablets, with front cameras fully supported with good resolution support.
I use Skype heavily on my Android tablets, and find it works as well or better as it does on the desktop.
Android tablets can become extra monitors for both PCs and Macs with the Air Display app. Once the app is installed and configured on the PC/Mac, it connects over Wi-Fi to become an extra display when needed.
It is a perfect companion to laptops for those occasions when one screen is not enough. Air Display is natively supported by OS X and Windows 7 like any external monitor.
Air Display- $4.99
You would expect Google's Gmail app on Google's Android platform to be good, and it certainly is. Heavy Gmail users may find the Gmail app to be reason enough to go Android, as it fully supports all functions of the online app.
Anything you can do on the desktop with Gmail is supported on the Android app, including labels. The app takes full advantage of the larger tablet screen in Android.