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Sweet: Windows 8: Task Manager is Amazing
For you power users out there, how many times have you wished you could see the specific processes that fell under every instance of SVCHost? Well, now you can! The new Task Manager in Windows 8 is nothing short of awesome. Another one of my favorite features is the "App History" tab, which allows you to see a snapshot of apps you've previously used, as well as other metrics about them, such as how much bandwidth they've taken up (finally, you can see how much data you've sapped from torrent downloading)! A very handy tool in Windows 8.
[See also: 10 epic Windows 7 pranks you absolutely must try]
Scary: Windows 8: No X-ing out of Modern Apps
One of my biggest gripes with Windows 8's Modern UI is the sheer amount of unused space by apps, as well as the lack of right-click functionality and application-close functionality (or "X-ing out" of an app). In this OS, you'd better quickly learn to use the myriad of shortcuts available to you, because you're going to need them. It's things like this that slap you squarely in the face to let you know that mouse and keyboard users were an afterthought in the development of Windows 8's usability.
Sweet: Windows 8: Windows Key + Print Screen Key
If, like me, you're a screen shot freak and take them all the time, then you'll be beyond thrilled by the addition of the Windows key + Print Screen key combo! When pressing these two keys, Windows not only takes a screen shot for you, but it also goes ahead and saves it as well. No more Snipping Tool or pasting the screen shot into Paint or Photoshop just to save!