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Snap view rocks!
Microsoft built the ability to run and display two apps side-by-side, a feature called snap view. This is a very useful way to work with two programs together. Snap view in Windows 8 is nice enough and improvements in the upcoming Windows 8.1 make it even better.
Some Samsung Galaxy Android tablets have this capability (called multiview) but it is more limited than the Windows 8 snap view. Any two apps can be snapped together in Windows 8, even the legacy desktop, while Samsung's method only works with certain apps.
Full-blown file manager
The Windows File Manager has long been a fixture on desktops because it is as good a file handler as that on any platform. The ability to perform any file function is a powerful feature on a tablet.
There are third party file managers for the iPad and Android tablets, but few of those are as powerful as the Windows manager. Windows 8 includes it in the box so tablet owners have it at their beck and call.
Security is important, especially for mobile devices that can be lost or stolen. A good way to keep data private no matter what is to encrypt everything so it can't be viewed without a security key.
Enter Bitlocker, an encryption method that comes with Windows 8 Pro and Windows 8 Enterprise edition. You can easily encrypt entire drives with Bitlocker to make sure only you can access the data. This can render a lost or stolen tablet useless for the finder/thief while protecting your private data.